(separated to keep a cleaner topic)
From the exterior view, there is room for an addition floor of the hotel. The new floor can house some side characters in order to elevate them to main character... Like Hana (damn, she's cute.) Maybe even Autumn's sister would want/need to move in due to unexpected problems at the cafe.
The extra room on the second floor can be decorated like a love hotel. Give it a heart shaped bed, big tv continually streaming porn or a video to tape the current action. Use it as an initiation chamber to initiate the girls into the harem, or for threesomes where you want to start in a "neutral" room.