Our stay in Seith's apartment was excellent. The bathrooms were great ! The apartment is really well located : it was the perfect place to discover New York City !
Still few things : the AC was still leaking (but Seith told us before we came) in one of the bedroom. So we used it with caution (and had to turn it off during the night) ! And the kitchen is not well-equipped (few plates and cups...) : it was not a big deal because we have found really nice places to eat our dinner as well as our breakfast !
We came with our two kids and the stairs were not a problem at all (just avoid using large suitcases) !