We stayed at Mohammed's apartment-hotel "Kaifa" for 3 nights with my wife and 2 kids.
My family and myself liked the assistance provided by Aamir, Mohammed and other guys to make our stay as cosy as possible. They were very helpful!
Rooms are nice and clean, as described.
Location is 15-min walking distance from the center of Istanbul.
It wouldn't be a problem for adults to walk, but kids it created some problems.
Another thing to keep in mind is a narrow streets causing to create traffic easily.
Overall, I liked the place and say thanks to Mohammed for hosting us!