Engin's place is great and the host is amazing.
I definitely want to come back here and I recommend it to others visiting Istanbul.
Engin is a indeed a super host. He is nice, kind, responsive, helpful, responsible, thoughtful and caring. He meets you for check in and is very welcoming. He speaks good English, too.
The place is lovely, well equipped, clean and nicely designed. The location is great and as a tourist you cannot wish for a better location (walking distance to Istiklal street and public transportation in Taksim square). Although the place is small, it has everything you possibly need. So feel free to pack your clothes only and do not worry about anything else. The place is great for a tourist who wants to explore Istanbul, but if you are not comfortable in a small apartment then this place is not good for you. Also the neighborhood gets noisy in the evening, so if you are sensitive to noise or looking for a calm neighborhood to relax, you should look at other parts of the city.