Great hosts! Friendly, react super quickly. They helped me and my wife get an Ikamet for Turkey. Whenever you have a problem, you can go to them. Just perfect.
Flat is just as described, very clean, modern. Just overall great. Just two things to keep in mind: The flat is on the highest floor, so in the summer you will need the aircon (there is one installed in the room, so no worries). And: The flat is really in the heart of Kadiköy, very cool when it comes to transportation. But it does get pretty loud if you keep the window open. So beware of that.