The flat is really spacious and looks exactly like the photos even nicer. The location is very close to the subway, and Taksim square. It is also very quiet and the street is not steep at all unlike the rest of Istanbul. One of the bedrooms is accessible through another bedroom with no windows, but this was no problem for us and even good for a family with kids. In addition to 3 beds, there are two sleeping couches in the living room and one in the bedroom.
Melih is an amazing host! He was extremely forthcoming and friendly. I asked him if he has an extra stool for the kids and he even bought one and brought it for us on the second day!!
Would definitely suggest staying there.