Very convenient location, middling service
Let's dispense with the good things right away: location is very convenient, steps away from numerous restaurants, shops, 4 blocks away from a big mall, the neighborhood is very lively at night. There are two buildings - the main one and The Lofts on 5th Ave - which has much bigger upgraded rooms. There is a restaurant on the premises (at breakfast you can get the usual selection + eggs cooked to order), fitness center etc.
Now to the not so good:
no wireless Internet in the rooms (there is a wired option), only in the lobby. The business center charges 69c a minute for a computer access and 99c a page to print. Breakfast is quite pricey at USD22.07. If your room faces the city street, the noise can be quite overwhelming sometimes, as the garbage trucks, construction drills and fire trucks can be quite loud. The hotel provides you with the earplugs and tries to explain that noise situation in a leaflet. The air-conditioner noise was tolerable. 
The quality of linen in my bed was dismal - probably the worst I had in years, same applies to towels. The cleaning personnel forgot to replace many towels (hand towels or the floor mat would not be there the next day), as well as mouthwash (appeared once in 5 days), body wash (twice). The utensils I used the very first night sat in my room until checkout. In the bathroom a protective plexiglass on the side of the shower cubicle was broken and one cannot open the door without noticing it - it was unrepaired for at least 5 days, so it tells you how much they care.
The bathroom tissue holder fell off twice. Little details, but they color one's experience.
Service as a whole was uneven: front desk personnel, all young and polite, but emotionally removed and uninvolved. When checking out, I was asked if everything was ok, I said no - the only response I got was: "Ok", with a shrug (and I am a Diamond HiltonHonors member).
The bottom line - if you travel with a laptop, don't interact much with personnel and care mostly about location - this is a good choice. iPad-owners, easy sleepers, and guest needing attention - look elsewhere. There are plenty of other Hiltons around (there is one across the street). 
If you are looking for a cheaper alternative to get to the airport - I used a shuttle from Marriot across the street - USD8, leaves twice every hour.