I had a very nice stay at Casper's place. He has a very nice (even if it is quite small) apartment. Everything was very clean and comfy. Unfortunately I have not met Casper personally but his room made was very friendly as well. Because Casper was not there we had to comunicate via mail, which worked perfectly fine. He seems to be a very nice guy! The apartment is in the middle of everything and a great place to start your sight seeing trip through NYC.
I can absolutely recommend Casper as a host and his appartment.