Nice people and location but tiny
I found the staff at this Hilton brad to be very accommodating. The restaurant staff was nice and the concierge was very helpful with finding restaurants, cabs, stores etc. They were the highlight of the stay. Even for NY though, this hotel is tiny. The two tiny elevators serving all 28 floors was a pain. The rooms were also incredibly small. The Fashion district Hilton has considerably larger rooms. 
I love the location because it's near penn station, but if you don't visit NY much Chelsea is a little on the dingy side. There's no shopping right outside the door or anything (unless you're on a hunt for leather and fur), but it is very accessible to other parts of the city.
However, the rooms were clean, solid, and what you would expect of a Hilton. 
Not bad, but not not great.