Me and my friend stayed in Kadikoy for two nights. We lived in Hakan's flat with him and his sister and it was very nice. We had a privat very comfortable room.
Hakan and his sister was very hospitality and interesting people.
Area outside is very nice too. A lot of supermarkets, good cafe and parks are there. 15 min to the Bosphoros.
I recommended this room and hope see Hakan again!