Great value, the apartment is conveniently located close to everything in the Galata / Karakoy part of Istanbul, with a metro station and tramways at walking distance.
Ahmet is very helpful and we kept contact via whats app for the duration of our stay.
The apartment corresponds to the description and we felt like home, we loved the terrace and the bed.
For people who don't want to do some (light) sport, note that the street and the whole neighborhood are steep, and that the apartment is on the 3rd floor with no elevator. My wife is 5 months pregnant and it went fine, but she did need to catch her break while going up.
We recommand and would come back next time!