Click on "Book now", "Okay" then "Rental of the desired room" to see the availability.
The image below shows that there is 1 hour available at 10 a.m., 1 hour available at 11 a.m., 1 hour available at 12 p.m. and so on. The room is therefore free from 10 a.m. to 3 p.m. Time at which you must leave the premises.
If you don't see 4pm, 5pm, etc, it's because the room is NOT available during those hours. So, do not select 2 p.m. and say "I want the room for 8 a.m." in the number of hours desired. It will not be possible. When verifying the request, it will be refused.