Isik is a great host and a great person, very nice and attentive.
He answered all of my messages and requests very quickly, he picked us where the bus left us and explained us the neighborhood (and even gave us a transportation car!).
He gave us a lot of tips, for example explained us how to go to the beach from taksim etc... Also, one night we accidentally locked the door of the apartment with the keys inside and Isik came to us to open the apartment in less than 30 minutes..!
Regarding the apartment, it's exactly as shown, it's big, well equipped, we felt like home there !
The location is also perfect : a living but quiet street with everything you need (grocery stores, little restaurants...) very close to Istiklal street, taksim square and to the bus station that leads to Ataturk Airport. From there, it was very easy to reach all the good places in Istanbul !
I would definitively go back there.

Again, thank you Isik !