NYC camera repair?
It's not at street level but on the second floor. So look up to see the sign. It's called Chrysler Camera (probably because they used to be located in the Chrysler building). Incidentally, they don't do sensor cleanings there. They do at the main store which is called Photo Tech and is located at 110E 13th.
CC/PT is somewhat expensive but I've never had a problem with their service.
Another suggestion is Nippon Photo Clinic, 920 Broadway, bet 20th and 21st.