This place is wonderful. Fatma and her husband are very friendly and helpful with local tips. The place is totally central, walkable to all the tourist stuff but still located a bit off the beaten track. The WiFi signal is strong. The neighborhood is bustling 24 hours a day and I always felt safe. Communication was easy and quick. In fact, I liked it so much here I extend my stay :)
I 1,000% recommend this place for your trip to Istanbul!