The apartment itself is excellent. It has great ambiance, nice decor, and everything is of high quality. It is only steps away from the metro and ferry stations, and the entertainment district. The room is very cozy with its own balcony, and feels isolated from the rest of the apartment. Mustafa is very friendly, attentive, and accomodating. One of the best hosts I have met.
My stay would have been perfect if it weren't for one problem. The problem is that when the bar downstairs plays live music, there is a lot of noise coming into the apartment. I believe this is due to the strange acoustics of the building. If you are not sensitive to noise or if you are out during the night on most days of the week, this would be an excellent choice to stay in Kadikoy.