My wife and I are due to visit Germany soon with friends who organized accommodation at a guesthouse in Bavaria (if that matters). Now, a few days before departure, the guesthouse contacted my friends with a request of all the names and birthdays of the people staying at the guesthouse.
I am not particularly keen to provide this information for personal reasons (I am happy that they have my name and confirmation that I'm an adult, but not my birthday), but I will provide it if it otherwise would create a legal hassle for the guesthouse or even endanger the visit. Is this request for personal information a legal requirement and/or normal practice for guesthouses in Germany?
Normally I would contact the guesthouse myself but the arrangements are via my friends and I want to keep my concern about this to myself for now.
Additional information that could be relevant: My wife and I live in the UK and I will travel to Germany as a British citizen, my wife has an EU nationality. Some of the other people staying at the guesthouse are citizens of non European countries and they will enter with a Schengen visa.
To my understanding, the guesthouse is self-catering and I do not think there is going to be a check in process on arrival.