My boyfriend and I stayed 5 days in Selim's flat as a holiday. The flat was clean and in good condition. It is very well located to view the main sites in Sultanahmet area.
Selim was extremely responsive and helpful. When we arrived, he greeted us in person and gave us a little tour of the neighbourhood.
The flat is good value for money and has all the basics needed for a holiday. However, if you are planning to cook some meals in the flat, the kitchen is a little limited. Other than that, we would highly recommend it!