We enjoyed staying at Ceyan's place. The flat is thoughtfully decorated, and the design gives a nice feel.
The host was very responsive and helped us to check the heating system within a few moments after contacting him.
The flat is situated close to Beyoğlu, so we were able to have nice walks, exploring the neighbourhood and visiting nice cafes. Just I would suggest being prepared for the stairs and hills in the area, however, they create the opportunity to see beautiful views from above.
I would definitely recommend staying with Ceyhan