We had a nice stay at Cristina's on the Upper East Side. The flat is very well located, walking distance from Central Park and subway. The room looked as pictured, although a little tired. On the practical side, it was great to have our own bathroom, also plenty of closet space and the room quite spacious. There's also a TV in the room, which some may find useful. The disadvantage was the fact that the room was very noisy in the evenings even though it overlooked a courtyard. This may be the rule in NYC though, I have nothing to compare it to.
Cristina was kind and welcoming, politely inquired about our stay, but mainly left us to our own devices.