My wife and I stayed at Aslan's seaview unit on the fifth floor of his apartment, for three months as an extended honeymoon and to experience Ramadan in Istanbul.
We found the balcony view breathtaking, and I spent many hours finding great peace and reflection there. The unit itself is located 10 mins walking distance from the Cemberlitas tram station, BIM grocery store, and there's also a corner convenience store right around the corner downstairs. The breathtaking Sokullu Mehmet Pasha Mosque and Little Hagia Sofia are within a few mins of walking distance.
Bear in mind many surroundings are quite old, some are run-down (old city area), and the streets are very narrow and difficult to navigate by car. But, they are walkable although you'll need to pass up or down major slopes so be careful if it rains or snows.
The unit had everything advertised; I did experience some connectivity issues with WiFi signal strength at times. I'm not sure if that was due to my laptop, or not. If you depend on fast internet, you may want to verify this with Aslan. Beyond that, we found comfort and security in the apartment and unit.
Bear in mind, as mentioned, there are no elevators here. You'll get plenty of exercise, but need to ensure you can safely walk up and down multiple flights of stairs if you're up higher.
Aslan was generous enough to help us check-in at an abnormal time past midnight, and arranged a private airport transfer for us. We received weekly - bi-weekly cleaning and towel/bedding replacement by very kind cleaning ladies, too.
The Washroom itself has good water pressure and was clean and well-equipped. The kitchen was also fit for extensive meal-prep. We experienced a few power outages, but were assisted in fixing issues. Once Mr. Kemal came by to show me how to reset the power and heat.
Aslan generally responded swiftly, with clarity, and great communication anytime I reached out. He even came himself to bring me some USD that I transferred, for money conversion purposes.
I definitely recommend you experience some time with Aslan's seaview unit.