Goksu is a lovely host! The apartment is very clean and the location is probably the best in Istanbul. This is an area with cosy restaurants, delicious food, nice historical streets and a lot of young people. Great connection to both airports. Getting to other parts of the city is easy with the ferry which is 10 min walk from the house. Ah, and the Metro is also 5 min away.
Goksu will tell you everything you need to know about Turkey and beyond! If this place is free - book it now :)