We had a pleasant stay at Handan's place. The communication was excellent all the time. She is so attentive. Check-in was so easy. The neighborhood is very secure and close to public transport. Taksim metro and Findikli Tram stop.
The home has everything you need. Airco was a huge plus, considering the humidity in Istanbul during the summer! And the view was amazing! The only thing that I can say about the apartment is the stairs, but I think you trade it with the fantastic view :)
Overall, it is an excellent stay; I recommend it!