I had to book the apartment the same day while I was sitting at an airport in Istanbul due to an emergency. Ertan was very responsive even with such a short notice, I was able to check in right away and everything went very smoothly. Apartment itself was clean and nice. The only issue was the noise from outside. If you have a light sleep like I do, I suggest you use ear plugs, I woke up several times due to noise coming from outside. The location in itself is great, the airport shuttle stop is about 10 mins walk, there is a street with a lot of shops and eating places nearby and quite a few places to sightsee.