The appartment was great! Almost all the touristic things to look at were in walking distance (around 15min), even a small bazar. The appartment has 2 floors and everything was as it is described and in the pictures. There are a lot of great restaurants around the corner for breakfast/lunch/dinner. Also a lot of mini Markets which are open 24/7.
Selim made a Group Chat with him, his co-host and us, which was amazing to communicate, he always replied within minutes! He organized us the transfer from/to the airport. If we ever go back to Istanbul we would be happy to book again :) It was just great! we loved it