I stayed at the apartment with my son for 6 nights. The place is exactly as in the pictures and as described by other guests before me: clean, comfortable beds (Istanbul is exhausting, a comfortable bed is very welcome), quiet, very good Wi-Fi (didn't use the TV/DVD, so don't know about that), easy to reach (near Pera Palace Hotel, a hotel that most taxi drivers know), near the shopping street Istiklal and many little restaurants. I can fully recommend this place. Hatice has been very helpful!
P.S. Plan enough time to visit Istanbul, it is after all one of the biggest cities in the world. But it is quite easy to orient yourself and to get around by public transport. Hatice provides you with an Istanbul card which allows you to travel on all public transport! (Keep a 20 TL-bill ready to recharge!)