You will have a great time in NYC...
as far as accomidations, you can check out craigslist.com. under sublets. Many people rent out their flats for a very good price. Williamsburg Bklyn (my hood) is very close to the city 1-4 stops to the east village, and there are some cheap accomidations there and you will still feel like your in the City... and Brooklyn is great!
Lounges - karma in the East Village on 1st ave is a hooka bar, very chill atmospheer and on Wed the play psytrance in the basement.
There are plenty of other pubs in the area too. There is a great dinner just up a few blocks that you can eat and drink after you party on Ave A and 7th called 7A.
If you like DnB/Jungle check out directdrive.net for the latest parties/lounge events they are great, laidback, and not expensive.
Touristy thing... my favorite is the midnight cruise around the city, drinks and amazing view of the city... its anywhere from 45min to an hour, but its a cool way to start of a night.
Eats - Silk Road (chinese food on the upper westside) cheap - great food and FREE all you can drink wine.
Hope this is a good start... Have fun, if you need more info let me know
peace Kido