Furkan's place is in an excellent location, check-in and check-out was smooth, he was easy to communicate with and was very helpful. You are a two minute walk to Galata tower, up the hill from Galata bridge, have a beautiful view from the terrace and the main bedroom/living room, and of course cafes, shops, street food, etc. are all very close.
My only criticism of the apartment is that it gets kind of stuffy due to little air movement, and while the main bedroom has a nice view, the bed takes up most of the room leaving no space for luggage. It's an ideal place to basically just leave your stuff and sleep but not to spend too much time inside - though why would you in Istanbul?! At the end of the day if you want to relax, you can walk up to the terrace and watch the boats go by.