The location of the flat is superb, it is close to the piers as well as to the center of Kadıköy. Most of the worth-seeing places can be reached with a few-minute walk. There are a lot of restaurants and cafés nearby and a variety of markets just around the corner.
The flat itself is small but cozy, very clean and it gets a lot of light during daytime. It is quiet at night. The owner is very friendly and helpful, she replies to any questions within a few minutes.
Should I come back to Istanbul, I will definitely have this flat on the top of my list to stay at.
Thanks a bunch, Tuğba!