The apartment, exactly as in the pictures, is very clean and very well located (just next to Taksim square).
The contact with Handan was very good before our arrival and during our stay. However, we had a small problem on arrival. We had to do a Self-checkin late in the evening and the key was not where it should be. Although Handan was unreachable at the time (and we never met her), people in a nearby rental agency quickly knew who to contact to give us a copy of the keys. Apart from this rather chaotic arrival, Handan apologized for the situation and in any case, I recommend the apartment which is well located, clean, comfortable to spend a few days in Istanbul!