We spent 3 nights at Sullivan's place and it was very great.
The location was perfect, just 5 minutes from the subway, the neighbourhood was very nice (Starbucks, groceries, very safe...), there is an elevator in the building (which is nice because Sullivan's apartment is on the 6th floor) the bedroom was spacious and clean, the bed was comfortable and there was A/C in the bedroom which was wonderful because it was 4 very hot days during our stay (we were there in August). We were able to park our car for free in the same street than the building (just be careful to the signs because depending of the day/hour you have to move your car for street cleaning). We did not met Sullivan but his roommate Kevin who was adorable. The only negative point is that we had to wait for 1 hour our first day, because there was a mixed up in the day of our arrival and Kevin was not at the apartment. Fortunately there is a very nice cafe "Le Pain Quotidien"on the first floor of the building with Free Wifi where we were able to wait for Kevin. Definitely a nice stay in New York ! Thanks Sullivan and Kevin !