We really enjoyed staying here. We were met and made very welcome, even though we were rather late due to flight delay. The flat is delightful, and very well situated not far from the top of Tunel, a small metro which gets you from the tram stops around Galata Bridge to the top of the hill, avoiding a steep climb. As I was just recovering from an operation and could barely walk when we arrived, this was very convenient. Everything you need is in the flat, and shops, cafes, restaurants all close by, in Istiklal Street, or off it.
The second, single bedroom is quite small, but adequate. There was a fan in the living room, and a cooler in the main bedroom. If it had been much hotter this might not have been enough.
The area is exciting, steep back streets, narrow lanes, lots of life all day and into the night, but the flat was generally quiet, except for occasional catfights (there are a lot of cats in Istanbul).
Shin and Arda very helpful. Istanbul card and Museum card very good value, esp as trams and ferries are very cheap.