I know that it's something that the user must have to decide in the booking form because it can have many room options, but in a other hand thinking of the service, it's the host job (and in this case, the front-end of the host is the Rooms system) suggest the best options to the guests.

It's somewhat frustrating when you do a search for the rooms, informing the rooms quantity needed, and in the next screen you have to put the same information again.