It was the best stay in Istanbul for us. Gulce is a great host.
The apartment is quite spacious and very bright. Everything is very convenient. There is even a separate small room with a wardrobe - where you can keep your luggage and stuff. Also there is a big TV screen with Netflix - which was a big plus for us as well.
We've been there in June and the temperature was comfortable.
The location is great - you have all the shops, coffee places you need and it's close to Marmara and ~15mins to the seaside.
The neighborhood is quiet and very green.
Our communication with the host was very nice.
So overall it's great - we would definitely stay there again.