Another hostel where I stayed in New York is the Hostel 104, located at First Street, between 104th and 105th streets uptown, in Harlem. It is accessible from the Line 6 subway, about 4 blocks away from the 103rd and Lexington Avenue station.
The hostel, located in a white multi-storey building, is fairly new. Among its amenities are free breakfast (although I wasn't to get one because I get up late), WiFi, electronic card access, a common kitchen, and included linen. There are also vending machines in the ground floor/reception area where you can purchase bottled water, juice and chips.
I got the private ensuite for $38 a night, and I would recommend it over the cheaper dorm-type accomodation (with up to 12 people to a room and a common T&B, like the pic above), as it affords you with a bit more privacy. Lockers are provided free but you have to have your own lock (you can purchase one at the reception for $5).
The beds and linen are clean, and the staff is accommodating. The WiFi is a bit iffy from my room though. Check in time is 3pm, and check out is 12 noon. You may have your luggage stored for free if you still have time to kill after you check out.
Address: 2027 1st Avenue, New York. Website: http://www.hostel104.com/