I really enjoyed my stay in this place. It provides everything you need, bathroom, fridge, AC, a well functioning heating. It is clean and there ist always someone at the entrance. People are very nice and will help you always. Don't forget, Istanbul can be quite loud, but this location is really quiet. And - the main attractions of Istanbul are just some minutes away. Also the waterfront, where you can watch the ships go by and the sunsets.
I would book this place again any time!