We stayed at Caspers apartment for four nights. Although we didn't meet Casper in person, communication with him before and during our stay was easy and he made sure everything went well. We met Artem, who is a funny and easygoing guy. Since he was out most of the time (or sleeping) it almost seemed like we had the apartment to ourselves. Only downsides were that the room we slept in felt quite small for two people and two suitcases and that we felt we should keep quiet when Artem came home from work and went to bed in the morning (I have to mention that he never complained or said anything about that! It was really just our own feeling, since we wanted to be polite. I am even sure he wouldn't have complained if we had turned the music up! ;)).
The neighbourhood is great. Close to everything. Also the nearby L Train was a plus. Good stay.