I had a great stay at Jon's place!
He was very accommodating with check-in and check-out times which helped relieve quite a bit of stress. You really can't beat the location! It is walking distance to everything in Greenwich Village. Within a couple blocks of Subways: Houston St on 1,2 and Spring Street on C,E trains. It is truly a NY experience: fire escape, walk-up, noise, and all! The walk-up is not bad by NY standards. A few short flights. Do not let it deter you.
The noise is as other reviewers and Jon describes. Running the AC unit as well as earplugs helped tremendously, and I am sensitive to sound so I don't say that lightly.
I stayed in March when the high was 26* during the day, and I would still run the AC unit, but on fan mode at night. As mentioned in his ad, there was another person staying in the second bedroom, but she was courteous and respectful. There is body wash and shampoo/conditioner provided for guest in the shower which is a nice touch.
Overall a great, stay!