Me and my fiancee stayed in Kaan's place for a week in January. It was an incredible stay and the view is as advertised in the pictures. The location was in a great part of the city, near Dolmabahce Palace, Istlakal street is close for shoppers, or you can go watch a Besiktas game in person as the stadium is nearby too.
The apartment size was good enough for two people. There is a partition that separates the bed from living room area for a bit of privacy. The apartment was spotlessly clean and appliances worked perfectly. There was enough closet space for two people. Fresh clean towels were provided, which is always appreciated. The heat worked fine, which was important for us since we stayed in January. There is a working elevator, so no having to climb stairs after a tiring day.
We never met Kaan in person, but instead had others, like Harun, in charge of helping. My flight was originally delayed for a night, but I had my fiancee (who was already in Istanbul) staying with me. They allowed her to check in without me and were very accommodating at any moments notice. We really appreciated the hospitality. Definitely recommend staying here!