Two of us stayed in this flat and found it perfect - we love walking so it was great to be walking distance from everything in Sultanahmet, the Galata Port area and even the Dolmabahce Palace. The location cannot be beat.
Çinar was really helpful and responsive, even booking us a taxi to the airport on our departure and letting us check out late. The flat was clean and there were towels, shampoo and basic things in the kitchen which was great. Having the options of both A/C and windows open was perfect for the summer weather.
The only reasons this flat would not be the perfect choice are if you need complete darkness and silence to sleep (a couple of evenings it was a bit noisy but nothing too bad) and if you struggle with lots of uphill walking as there are a lot of steps around. It is an ideal flat for exploring the city and popping back to rest.