With Kayak, when looking at hotel search results, there is a dropdown under Price (circled in the screenshot below). The default is "Nightly base price", which does not include taxes and fees, but you can also select "Nightly + local taxes & fees" or "Total stay + taxes & fees", which accomplishes what this question wants.
Not sure if this is what you would be looking for exactly but I did find on Googles hotel search that you can put in a start date and end date and search. When on the search results page you can click on the little bar chart on the right hand side of the dates and give you a little chart of when it's the cheapest. Google flights is similar as well.
I was searching for a room with booking.com, and when it displayed results, it included shared rooms. And just under the "order by" pane, there was a pane with a text and link:
Clicking this link filters out shared rooms.
Yes! I actually just posted about this - IATA has released an interactive map that shows you the countries, restrictions, etc, based on Timatic data, as Frank has said in his answer.
However, you can also look at Travelbans.org, which is another site you can use which gives you continuously updated information on travel restrictions for every country.
For the hotel chains Hilton and IHG this is possible:
For Hilton this is an official feat of their booking site. Select a hotel, a room type and a rate, click "change dates" and you'll arrive here:
check the button "Use flexible dates" and you can see the best rate and scroll back and forth by as much as you want.
tip of the hat to travel-...
I'm not aware of any hotel search engines that allow you to search for a desk, or filter on a desk.
However, in my experience most hotel rooms have a desk. (at least in well known brands) I usually stay in hotels from known brands (Marriott, Hilton, Best Western, Choice hotels, Radisson, ...) and have yet to encounter a room without a desk. I have read ...
I think your best bets would be:
AirBnB (you can search for a place with a place for a laptop, and that means a desk)
Searching on Booking.com for apartments instead of plain rooms. The cost is the same, more often than not.
After all my traveling in Europe I've yet to find an hotel which has not a desk
I suggested Booking.com because it is ...
Booking.com does exactly this.
I just did a test looking for a place to stay in Antwerp. You have to scroll down for a while on the results screen and then you will see this in the left-hand column:
(It's beneath all the filters you can set)
Hostelworld has a price breakdown that we can use with a few drawbacks.
If you can find the hotel/hostel/spot under the bridge that you want to go to on the website, you can specify a travel period ("stay") of up to 15 days. Then pick your place and go to where the price is displayed. You will find the option "View price breakdown" give you the price per ...
I don't think that there is a single popular platform for finding accommodation in Poland. There are at least few sites that seems to have decent amount of listings like nocowanie.pl or noclegowo.pl. Also Polish equivalent of eBay - olx.pl has some offers here.
Of course AirBnb is quite popular (especially in touristic places), but prices seems to be more ...
As far as I know, such website / database / service covering your five points doesn't exist.
For your first 4 points, one typically resort at manually going through https://www.iatatravelcentre.com/international-travel-document-news/1580226297.htm and ideally trying to double check the information with the country's websites and airlines, which is error-...
This is only a partial answer, taken from my answer to another question. In particular it is only practical for a limited number of hotels, limited number of days and not always precise.
Hostelworld has a price breakdown that we can use with a few drawbacks.
If you can find the hotel/hostel/spot under the bridge that you want to go to on the website, you ...
Actually, it turns out that the regular hostel search engines do allow you to search for private rooms specifically, and sometimes for family rooms even more specifically. But on all of them you have to do an initial search, and only then can you access the "filters" that let you specify room type. This was not straightforward to me, and I thought I was ...
As far as I could find, there isn't any search engine that can specifically find late-checkout rooms. Some hotel chains offer it on their websites or list the late-checkout in their description, but you'd have to manually go through the list of hotels in the area. For example, you can search for "Montreal" + "late check out" in Google to find some options.
In a comment you said maybe what I’m looking for is not a search engine for hotels per se, but ‘travel experiences’ instead.
Searching ‘where should I go on vacation’ or similar throws up a raft of recommendation sites such as https://www.cntraveller.com/gallery/top-holiday-destinations-2019, including a few that let you input your trip criteria before ...
Using Booking dot com you can find in the whole country and filter by "hostel" so you can get at once all the prices. Specifically for Japan here's the link sorted by price and filtered to show only the hostels. You have more than 1000 options to choose from 7 euros.
This is just an example and have in mind that Booking has not all hostels in Japan, but ...
No booking websites currently support this, however you can at least search a given area for a list of available hotels using Foursquare's Draw feature:
You could then book one of the hotels you've found on a different website.
You'll have difficulties to find such a site. Still, a bit of logic will allow you to predict which dates are the best and then you'll just need to verify that your assumptions are right.
Here are the factors influencing the hotel rates/level of frequentation:
major convention or event in the city
bank holidays next to a week end
So, a bit of digging shows that this isn't a new question.
It's been asked in several places around the Internet.
One notable example is a site called MightyTravels, which, in an article about this exact problem, makes an interesting claim at the bottom:
Did you know – with Mighty Travels Premium you can search 365 days of hotel rates sorted by deal ...
Expedia. Usually what you pay in advance is the total amount without any more additional fees. If there is anything else to pay, it's written in the order confirmation.
When you select the room you also get the comparison between different options: free-cancellation, not free, etc..
No such tool currently exists as of 2017. However it should be trivial to write a small bot that would parse Hostelworld/Booking.com listings and spit out the options sorted by check-in time. If someone writes such a tool or creates a web service this answer will be updated.
There's an easy way to do this for a limited set of cases. If your destination is a popular tourist area, go down to a bricks and mortar travel agent and get a brochure for holidays in the area. Most of those have a table of prices for the same vacation on different weeks or months. From that you can tell which are the cheap months.
If you don't want to do ...