Dirty room and unhelpful, hostile staff.
Cons-The linen was dirty, furniture had suspicious stains, the front desk staff rude, 24 hour room service closed for 3 hours in the afternoon without notice (we needed it because of odd convention timing), heating in room didn't work properly (it was 36*f outside and snowing). We heard every noise from the room next to us and the hallway. 
Pros-The location is ideal for everything from shopping to restaurants.