My boyfriend and I stayed with Chris for 9 days and the experience couldn't be better. He has a very cozy and clean apartment (exactly as depicted in the pictures), perfect to rest after an exhausting day of tourism around the city. It is very well connected to Manhattan via the train C (subway costs $29 unlimited use for a whole week). If you come back late at night (later that 10.30 or 11pm, I would say) you need to take line A (express version of train C) which does all the stops during late night time. It takes between 15-45 minutes to go to Manhattan, let's say 15 if you go to the Financial District and 45 if you go to Harlem.
The bathroom is outside the room and is shared but that wasn't a problem for us at all, I wouldn't consider it a drawback for staying in Chris' apartment. I also should mention that the shower works really well, good pressure and good temperature. (Maybe it sounds silly to say this but I know for many people this is important!)
The bedroom has a very good size and the bed is comfortable. He provides clean towels and sheets, and also access to iron, umbrella and other useful things. AC works very well. It also has a very big closet where you can keep all your clothes so you don't have to leave everything in your luggage.
Overall, I would recommend staying there to anyone, I can't imagine anything going wrong in Chris' apartment. We didn't have the opportunity to know him well because we all were away during the day, but he is very respectful and offers all the privacy you need to feel comfortable at his house.