Overall we had an awesome stay at Seth's place. I stayed for a week with my mom and 2 sisters. The apartment was by far big enough for all of us to be comfortable, and there's also a great terrace out back. The place is literally less than a block away from the subway making it super convenient to get into Manhattan (about 10 minutes on the subway I think). And there's also a couple of great cafes between the apartment and the subway.
Seth was also easy to contact and stayed in touch throughout our stay, he gave us some great "local tips" of things to do and cafes to try. My only complaint is the place was a teeny bit dirty when we first arrived - but I also know they had other renters in the week before we were there and Seth and his housemates weren't around between them and us.
Overall - awesome host and awesome stay!