I stayed at Cansu's place twice over the course of a week (I flew out to Cappadocia for a few days in between). Her place is clean and comfortable, and looks just like the photos. It has all the amenities you would need, with lots of shops and restaurants all around. The rooftop terrace is delightful for relaxing with coffee, tea or a glass of wine - a nice view of the city. I quite enjoyed the Kadiköy area. There's lots to see and do, nice being close to the sea and easy enough to get across the the other side.
Cansu is a helpful and thoughtful host. Communication was great.
Highly recommend this neighbourhood - and Cansu's place - for anyone travelling to Istanbul.