Sarp was really nice and responsive. He was easy to talk to and very welcoming. And we really liked the apartment. It was big and comfortable. Clean. Really nice couch and a big table. The kitchen had some essential stuff missing though, for example there wasn't a knife. The location was also really good, calm area but really close to all the nice places in Kadiköy. Just 100 meters away there was a good vegetarian restaurant and bars and cafés was just a short walk away.
The big downside to the apartment was that we after six days (we had booked it for two months) heard a knock on the door. It was the police saying that it was something illegal with the apartment and that we had to pack our bags and leave within ten minutes. Sarp tried to fix the situation but we weren't comfortable staying there anymore so we went to a hotel and then found a different airbnb. Hopefully they will solve this for future renting.