Stayed at the apartment for 4 nights in March 2019. It’s located in the Fatih district - inside the historical city of Constantinople.
The neighborhood is quite local - read not very touristy. Still there are a number of shops and good value local restaurants within an easy walk.
The Chora Church is about a 15 walk north, while Sultanahmet is perhaps a 45 minutes, with cabs being easy to get on the main road.
The house itself is several renovated flats combined to form one unit, spread across 4 levels. So if your traveling with a group it’s a good option to have both common spaces and some privacy. Just be prepared for many sets of stairs.
Our host went above and beyond to help us during this stay. She met us at the house on arrival, was extremely friendly and gave us a lot of good local tips. At the end of the stay she was very helpful in setting up return transportation to the airport. I would highly recommend her property, especially if you’re interested in visiting/staying in the most historic areas of Istanbul.