Unfortunately, the apartment is not up to standards and is different from the pictures. The apartment smells really bad, there were many personal belongings left everywhere (closet, bathroom, kitchen). The bathtub is not in good condition and the outer space is dirty and not appealing at all. Furthermore, the apartment wasn't clean.
The location is indeed very good, there is a nice view of the Bosphorus and you get the feeling of being in a very local spot of Istanbul.
Deniz was very friendly and polite throughout our communication and she agreed to give me a refund. What was off was that she requested a screenshot of a nice comment posted about them because nobody did this before. She said that this was all she needs to be sure she is not getting a bad comment from my side before issuing my refund.
That's not the spirit of the Airbnb community (I hope) hence I am posting this review.
I hope that Deniz had just a bad day and that my case was only one incident.