Chiko was very hospitable and helped us with lots of questions we had.
The apartment was clean and very well located (Galata tower is right around the corner)
It is surrounded by many restaurants and bars. The view from the rooftop was beautiful, although the table one could see on the photos wasn't there, so there was no place to sit.
One thing I didn't expect is that the sound isolation is not the best (as the building is probably very old), so it was quite loud, especially from Friday to Sunday (as bars and restaurants around the place were opened longer). Also, one of the neighbours above enjoys listening to techno music with bass turned up to the max in the early morning.
Otherwise, a great place to enjoy Istanbul!