Hi Sylvia,
I usually stay with family in NYC, but I have some experience with hotels. My suggestion is that you look at Orbitz and then be very careful to check TripAdvisor for reviews. Especially in NYC, hotels that look good on paper are sometimes downright scary!
BTW, I have my cabin-mate for the eastbound on the 19th (someone from my univ, in fact), but am still looking for a roommate for the return on 24 July if you hear of anyone!
If I can be of any help re hotel assessment, let e know. I know NYC very well!
Best,
Sarah