Hakan is a very nice and friendly host, communication was great. There were minor issues and Hakan responded immediately and fixed everything.
The location is also great, the apartment is near marmaray and metrobus, Kadıköy metro station and Moda are at a walking distance. There are shops and restaurants nearby so you can buy everything you need. The neighborhood is quiet and safe.
The building is relatively old, be ready to climb spiral staircase to the 3rd floor. The apartment itself is not new, but nice and cozy, decorated in minimalist scandi style. It has practically everything that is needed for a few days trip.