We can only recommend Hamza’s place. We stayed 1 month and we really enjoyed our stay.
The location is perfect if you want to discover a less touristic neighborhood of Istanbul and enjoy the everyday life of the city. You have a lot of very nice bars and restaurants nearby and the atmosphere of the neighborhood is very peaceful. And it is super easy to join the European side, either by boat (10 minute walk from the apartment) or with the Marmaray (6 minute walk).
The apartment is very clean and you have everything you need inside. We were here in winter and the heating system works well. The internet connection is very efficient and the bed is comfy.
Last but not least, Hamza is very helpful and available. He showed us around so that we learn to know about the neighborhood.
Thank you very much again for everything Hamza!