bathroom and shower somewhat small; if you have to set a lot of items.
them may be short of plug adaptors if you need one, you have to pay if you want wifi in your room, 2 computers with wifi in the lobby, that you have to pay, and sometimes out of order.
A large turn-over at the reception, which may make them mistakes by being unaware of things (fortunately, the manager know how to fix these unpleasant shortcomings).
breakfast just acceptable.
The difference between room types might be very large, in area, location (view), number of plugs, etc.
the perfect location, at the center of everything (particularly, public transportation, taxis, etc).