The communication with Mehmet was really great, he answered within minutes!
He helped me to prebook airport transfers. Check in and check out smooth, without any problems.
The location is very good, many tourist attractions, like the Blue Mosque and Hagia Sophia in walking distance.
The flat is very nice, a bid terrace overlooking the Bosporus and a balcony with view from the Blue Mosque.
When I am in Istanbul again, I will book this flat again for sure.