The bike rental shop was a little hard to find and didn't have much in the way of signage to help, but once I found it they seemed friendly and helpful and didn't make it a big deal when I brought the bike back a little late because it started raining and I had to walk it back.
The=is designated bike rental company is about 3 blocks away from central park! It is quite a walk to pick up and return the bike if you do not want to bike on the Manhattan streets.
Bikes were fine but the rental place's temporary location was kind of far from the park.