Most have bathrooms but remember that rooms with no showers or toilets are cheaper. Rooms are large, nicely furnished, and carpeted. Some even have air-conditioning, and all are soundproofed and feature minibars and hair driers. There are laundry services and non-smoking rooms as well. But this shouldn't be a worry, the rooms are soundproofed.
Breakfast is included in the rates and can be served in the room.
P.S. Check to see if you're lucky enough to have one of the rooms with a balcony.