It was really good choice. The host was very kind and supportive. He meet me personally despite of my very late arrival due to flight delay. Hasan gave me a lot of advices and tips about good staying and comfort. Apartment is located perfectly, in the heart of Beyoglu, 10 min walking from Taksim and Istiklal. The flat is small but cozy, very bright and clean. It nicely fits to 1 or 2 travellers. Even though it has small place and required amenities for cooking I recommend to get meal somewhere outside - it's more convenient and authentic.
In summary I do recommend the host and apartment for people traveling along or as a couple.