The apartment is located in a nice Upper East Side area and is only a couple of blocks from the nearest subway station (and that subway station, unlike most others in NYC, is new and is air-conditioned) and within an easy walk of grocery stores, drug stores, restaurants, and more. Make sure you are capable of bringing your luggage up and down several flights of stairs to/from the apartment, which is on the 4th floor -- and the stairwell is not air-conditioned, so I was a sweaty mess by the time I got to the apartment.
For some reason the address provided by Airbnb when I first paid for my reservation is not correct (one street north of the actual address), and I was given the correct address in an email from Mary two days before check-in.
The apartment is quiet (on the back side of the building), a huge plus for me! The bed was comfortable and the TV in the bedroom had many channels to choose from. The apartment was clean and, while not large, is not too cramped for one or two people. The bathroom is small but clean and there's enough room on and around the sink for your toiletries. The shower worked fine and had good water pressure.
It was easy to get the keys for the building and apartment at a 7-11 store very close to the apt building, and the building is very secure -- front door, then a second door (both lock automatically as soon as they close), and a second key is needed to enter the apartment.
It was warm and a big muggy while I was in New York, so the A/C unit in the bedroom (the only one in the place) kept me comfortable while sleeping. It's a small unit that did not cool the rest of the apartment that much (aside from the bedroom), so I suggest that you close the bedroom door while sleeping to better cool the bedroom.