Basics, Rough Bed, Good Locatino
I stayed 8 nights at this Hilton.
This hotel is in a good location - though it can be a bit smelly around the area because of the Market. The room is a decent size (had the king suite), but it's very dated, extremely uncomfortable bed (the firmness dial etc, did not do much for me). You can't jump on the bed after a long day, or else you'll hurt yourself. Even on the soft setting, it was hard. Got so many lumps and aches, not even funny.
The bathroom is very very small. 
The pool is tiny - 3'6" with 6" of water missing - not much to swim in. The fitness room is small.
I would expect more space/machines for a hotel that has hundreds of rooms.
The staff was friendly, but they need to communicate better. I was told my room was not available when i got there early, only to get to my room and the maid told me it was ready ages ago. Not Cool.
Overall, it's an average hotel. I would stay elsewhere to be a bit more comfortable. Philly is a small city, so look at other options.