To be used for questions in which the company Booking.com is important.
Booking.com is an online accommodation booking website started as a small start-up in Enschede in 1996, based in Amsterdam, Netherlands and since 2005 owned and operated by United States based Priceline. Its operations and call-centre is in Wyoming, USA. (From Wikipedia.)
http://www.booking.com/ are widely used in Europe and North America and likely also in other parts of the world but they are certainly not the only company that offers alike services. Some alternatives include but are not restricted to http://hostelbookers.com/ and http://www.hostelworld.com/ http://www.hotels.com/ http://www.trivago.com/ and more general sites like https://www.kayak.com/hotels and https://www.travelocity.com/