Good Location, Not as Nice as the Star Rating Suggests
The first thing i noticed about this room is it has literally the worst view of any hotel room I've ever been in -- and I've been in some in Europe that also had no view -- we literally had a view of, well, a fire escape or something. If that. There was one window in the room, about 2 feet wide by 5 feet tall. So, you're going to get very little natural light in the room. Room was pretty clean.
The rooms are OK, but the furnishings are subpar for a 4-star. Room is small, but that's par for the course, and forgivable, in Manhattan. Location right next to Grand Central is a plus, near the 4/5/6/7 trains. 
I'd say, it's a good hotel if you can get it cheap (say, around $100/night, about what we paid), but it really rates closer to a 3-star than a 4-star.