We were two families with two children each an have spent a week in Chelsea's apartment. There was a lot of room available for all of us , and also a good privacy as the flat has multiple bedrooms and bathrooms in different floors.
I would say everything we needed was there for a very comfortable stay.
The kitchen was incredibly well equipped although we have used only for our breakfast. The location is 3 blocks from the main subway lines and the shopping area on 125th. Dowtown is no more than 20 minutes travel by metro and half an hour bus. Also some restaurants in the nearby including our good friend Babbalucci where you can eat a fantastic pizza. The neighbourhood is a coloured experience of Harlem humanity , nothing dangerous but to keep at distance particularly at night.
All in all we had a great stay in this cozy flat that I would definitely recommend.