Rooms of any categories can be booked in Hyatt Regency Tokyo hotel via Horse21 reservation system. Enter check-in and check-out dates and the number of guests, then press "Check availability". The system will list available rooms and rates; choosing one of the given possibilities you will get onto the page of definitive reservation. Fill in the form, read and accept Horse21 booking Agreement and then press "Book".
Hyatt Regency Tokyo makes part of the Hyatt hotel chain. You can see all Hyatt hotels in Tokyo on the following page: Hyatt hotels in Tokyo.