We stayed at Ilkem's place for a month and we really enjoyed our stay. The location is great and safe, there are a lot of grocery shops, cafes and bars nearby. We stayed with a dog, so it was important for us that Cihangir parki is in the five minute walk distance.
The apartment is really clean and actually looks more like a hotel room (this is a plus for me). The bathroom is the best of all I ever seen at Istanbul. Though the kitchen is really small and if you are planning the long stay it may be a little inconvenient to cook a lot. The Wi-Fi is fast and absolutely sufficient for a remote work.
Ilkem is a great host, it was a pleasure to communicate with him, he always responded fast and helped us with all our questions and needs. I recommend the place and Ilkem as host very much!