It's not a futon exactly, but a very comfortable mattress with blankets, pillows and everything, with a thick dark curtain to ensure privacy. I sleep rather deep so wasn't aware of noise on the street. The apartment is interesting in comfortable as a whole. The only thing is there wasn't a hairdryer. And there's only one bathroom, but during my stay there wasn't an issue with it.
Gaudhi and his brother are both very friendly easy going people, we could use the computer, the kitchen and stuff in the fridge, and we chatted quite a bit. Gaudhi was so nice as to wait up and take me downtown for bar and food in the middle of the night one day.
The location of the place is pretty good, close to 2,3 subway and buses, close to Central Park. 24x7 place to grab a sandwhich just around hte corner. The neighbourhood was rather safe as well, as a single female I didn't freak out when walking alone to the subway after midnight.
It's my first time using Airbnb and it's great to find such a great host. If I go to NYC again I'm very likely going to stay there again and be a less messy guest :P

I wrote a bunch and just saw the notice that I should write in Chinese...Since I never saw a great auto translation I'm going to write this bilingual.
实际上睡的地方不是沙发而是床垫，床垫被子和枕头都很舒服，有帘子遮住保证私密性。我睡得很熟，没有听到街上的声音。公寓很舒服，设施齐全，少个风筒。只有一个洗澡间，不过我在那里住期间没有遇到问题。
房主和他弟弟都非常友好，和他们聊天很愉快。我可以用他们的电脑、厨房和吃冰箱里面的东西。
住处地段很好，离2.3号地铁很近，有公交车，离中央公园几步之遥。周围环境比较安全，我作为一名单身女性半夜走到地铁站也不会害怕。
第一次用Airbnb，体验很棒。下次去纽约还找他们。