We stayed one week in Murat’s apartment and we loved it!
The location is perfect - I’ve visited Istanbul more than once and the area around Galata Tower is definitely the place to be at. In addition, the apartment is hidden from the busy streets and the bedrooms face a courtyard, so we had no problems sleeping in till late.
Another thing that was important for me was the heating since we stayed in February/March, and we definitely stayed warm in the apartment.
Other than that, the apartment has what you need. Even the HDMI/USB-C adapter in case you want to connect your iPad/MacBook to the TV.
And then, the most important thing is that Murat is a great host. He responds quickly to any queries and shows you that he really care about his guests.
I would most certainly stay again in the apartment, and most likely I will.