A clean apartment in a very nice location. The check in was a bit messy, the entrance to the building does not look like a residential entrance. In addition to that, Yasin met me 5 hours later than we discussed. He actually arrived right before I was about to check in to the hotel next door. His friend was in contact with me, and during the communication I was not given a clear idea when I could expect to check in. It was a very tiring 5 hours in the cold, but I understood there was some kind of an accident. After the check in Yasin even brought me dinner from a local place to cheer me up, for what I say thank you very much, the dinner was very much needed :)
The apartment is right next to a mosque, so, if you are a light sleeper, bring earplugs with you. Also, for some guests it might be important to know that the bed is very hard. As for me, neither mosque nor the bed caused any problems.
The bathroom is freshly renovated, but from my understanding, it is not heated. Therefore, if you stay in Istanbul in chilly time of the year, you might be careful taking hot showers. Since the apartment is in the old city and in a pretty old building, I assume that unheated bathrooms are a common thing.
The apartment is 9 mins away from a tram station Cemberlitas and 15 mins away from Ayasofya mosque. There are plenty of cafes nearby and nice places with a typical Turkish breakfast.