Our stay was very good. The terrace and the views are beautiful and the apartment was well equipped. Our host was very communicative and helpful, she even helped us get a taxi to the airport. The location's just amazing, 2min away from Galata Tower and Metro station, several buses available, etc.
I don't recommend the apartment if you're a group of 5 as the extra bed is a bit uncomfortable. Also not recommended for old people as it's the 7th floor without an elevator, although that wasn't a problem for us. We really enjoyed our stay, highly recommended!