I had one of my best experiences in this place. The apartment is very comfortable and modern. The furniture and espicially the beds have high quality. In addition, and unlike most of old Istanbul apartments, this one is quiet spacious. I can't think of anything I didn't like.
The host was very responsive and communicative.. he did check on me and made sure that everything was allright, even without me asking. Also, he did recommend some great places for me.
In summary, great host with a great place. Having the chance, I would definitely come back again.