We found Saban to be a great host. He is very kind and extremely responsive to our calls. We had a great time at his place which is close to Blue Mosque (10 min walk), Hagia Sofia (15 min walk), Topkapi Palace (20 min walk), and my favorite Sultan Sulayman Turkish Bath (6 min walk). Couple of reviewers made negative comment about weak WIFI but we fond it very fast @ 35 Mbps. This is more than sufficient to surf internet, check emails, watch movie at the end of the day. The only downside was late in the evening some locals play really loud music and early in the morning there was heavy traffic / noise. We closed all the windows and that solved the problem.
If you are planning to visit Istanbul and visit all cultural sites, look no further and book this place.
Thank you Saban.