Avoid 28th and 29th floor
There is a bank of elevators which run only from level 1 to level 27. There is constant humming noise that goes every time one of the elevators is running. This noise appears to come from the elevators serving floor 1 to 27, and goes beyond the rooms close to the elevators on the 29th floor.
The hotel also charges $4 for bringing a corkscrew to the room.