Me and my girlfriend were on a four-day trip in Istanbul and stayed at Handan's place. It is situated in a quite street just a minute away walking from Taksim square. You can find also a lot of bars, restaurants and shops in walking distance. The Galata tower is ca. 20 min away walking from the apartment and Hagia Sophia - about 45 min. walking. The apartment was very clean and as described. We had everything we needed to have a pleasant stay. The internet connection was also good!
Handan is very, very kind and friendly host. She wasn't able to be there for the check-in, but she has organized everything so that we had a very comfortable and easy check-in without any problems. She was in regular contact with us via Whatsapp and responded very quickly to any questions we had. So, we had the feeling there is somebody we could contact if needed. She also recommended us some good places for breakfast and dinner. The check out was also very easy and comfortable. Since we had to be picked up by a shuttle one hour after the planned checked out, she let us stay at the apartment till the shuttle arrived, which was really great and kind of her!
To sum it up - I'd recommend Handan and her place!