the elevator is really not stable, terribly vibrating when starting or stopping. if you do not have a strong heart to take roller coaster, do not use the elevator. you can walk by stairs once you have to book the hotel without other choices.
of cource, to be honest, the location of hotel is convinient to old city, hbf, messe etc, and the room is clean.
by the way, a female accounter was pretty rude, when i double confirmed the information, she answered like i owe her money, being not happy on the face.