My experience at Gyl Shanne's place was great on all levels! The flat is exactly as described/pictures and the room is comfortable and cosy with a very nice view. It is very well located, at a walking distance from Beyoglu's center and all its attractions (Istiklal, Galata etc.) and different public transportation.
Gyl Shanne and Ilker are very friendly, welcoming, caring, helpful and respectful. We shared very good moments together, in the flat and outside! I loved staying in Istanbul at Gyl Shanne's place, and hope will visit again soon :)