It is as central as it can be! A couple of minutes walk to the Besiktas market. 10-20 minutes walk to the Besiktas ferry terminal and the station of the shuttle to the new airport. And there is a convenience store downstairs right in front of your door which is open till late.
The place is clean and comfy. The red sofa you see in pictures turns into a large bed too and you can ask for extra sheets. The cleaning lady makes regular visits if you want.
There were a couple of plumbing issues that Hakan wanted to fix but I asked him to postpone it to after I leave. Hopefully they'd be done by the time of your visit!
Also, please be aware of the 2 stories of steep round stairs to the apartment, if you are caring for the elderly/disabled.
Overall a pleasant stay and is recommended.