We didn't have much time to speak to Mark but he was nice and made us good impression. Moreover he was accomodating because we arrived late and for departure we had no specific time to get back the apartment.
The apartment was nice, exactly the same as on pictures. The neighborhood was good too. Near Chinatown where we ate best chinese dumplings ever :). Subway was close. Be careful if you are very sensitive to noise and light to sleep because the windows have no shutters. Fortunately this is not our case so we slept well.
To conclude, Mark's apartment is a nice place for a little trip in New York !