I definitely suggest this place for multiple reasons.
First the host: Mert always tries to help and he is always available. Even at the beginning when we had hard time getting a taxi he did us a favor and picked us up. During out trip he gave us advice regarding nice places to see and guide us regarding getting HESS code. In Turkey it's very important to have a good host, because things can go wrong like water or power cuts on district level for a few hours and mert was always on top of it, letting us know that it's from the city level and will be back soon.
The place itself is one fully equipped room with private shower and toilet in an apartment, which is located at a very nice part of besiktas in Istanbul. Walking distance to the Şehir Hatları Ortaköy Vapur İskelesi which is always fun and crowded. We saw multiple wedding pictures being taken while walking by the water.
When you talk to locals they might tell you the price is expensive, but their pricing is based on 1 year contract. Compare to hotels and other AirB&B places in that area, the price was very fair.
I will definitely come back here again.