We enjoyed our stay at Can's place. Can was very responsive and helpful. The apartment is located right in the heart of the historic Galata district, which is highly convenient for exploring the city. The kitchen space is quite lovely as well.
There were some drawbacks, however, which I wanted to mention so that future guests could have more accurate information. We came to Istanbul with five adult family members and wanted to stay together instead of living in separate hotel rooms. Unfortunately, I would not recommend Can's apartment for this purpose. The beds are jammed in just two bedrooms and the living room, all located close to each other. (We were surprised about this given that the apartment ad mentions four bedrooms.) With very squeaky floors and doors and a lot of noise from cars and motorcycles outside, we all had a lot of trouble sleeping at night. Overall, I would say we regretted not searching for other options.