Demir is a great host! He always was helpful and answered all our questions rapidly. The location of the flat is pretty good. We mostly used a ferry instead of subway, because it was nicer and not so crowded. Also a lot of delicious local street food nearby. We liked to have a breakfast in Mado cafe (try, you won't regret 😄).
I can recommend only one thing for improvement - cleanness in the bathroom.
From my point of view, Demir's apartment is one of the best ratio of price and quality in this area👍