Clueless front desk.
A group of colleagues booked this hotel through our company during a snowstorm. Our office is in Manhattan, and we needed a core group of people to be able to get to work even if there were transportation issues. The problems started from the initial check-in and continued well after we checked out.
My co-worker and I stayed on a Tuesday night after we worked late. The rest of our group was checking in Wednesday. When the first of the Wednesday people went to check in, they gave him the same room - so he was able to get into our room, where all our things already were, because they gave him a key to the same room they'd given us the previous day. Of course, this meant when we got back that evening, our keys no longer worked. 
Our boss had given the front desk a list of who was to be in each room, though all the rooms were booked on her corporate credit card. When the person who got into my room straightened out his situation and got a new room, they put his roommate into a third room and refused to believe him that he was supposed to be with the other guy.
BOTH of those two roommates ended up finding charges on their personal credit cards from the hotel, which had asked for their cards for incidentals. One was charged $680, and the other $300, even though our boss had taken care of the rooms on her card.
Despite the fact that the front desk had the list of our names, at least two members of the party were told there was no room for them when they went to check in. One had to have his boss call and say "This person in front of you holding his ID is person XYZ for room #x."
Another co-worker was asked by the desk for her card for incidentals, and something they said later struck her as odd. When she went back to double-check, they had indeed transferred the charges for all six rooms onto her personal card. Thankfully she was able to get it fixed at the time.
When I went to check out, I requested a receipt (for corporate verification purposes). The girl at the desk also tried to charge me $680 for my room's two nights. I told her it had been paid for already and another woman at the desk who seemed to know what was going on a little better showed her where on the bill it said it was already paid.
Overall, this hotel's front desk was severely lacking. They caused a number of headaches for my group during an already stressful week, and several co-workers are having to fight to get refunds to their credit cards. When they've gone over to dispute with the manager in person, they haven't gotten much help - the staff couldn't find the documentation, in one case.
The rooms were also in need of upgrade and somewhat dirty.