Host - I've been using Airbnb for a quite a while and I can say this is one of the best place I've been because of how Tamer(the host) will treat you. Although there is a gap in communication due to language difference, he will make sure you are comfortable and he is always willing to help with everything.
Room - It is small, maybe enough for 1 person but it fits all my needs. I have to do some remote work during weekdays and I feel comfortable doing it in the room. There is also heater in the room. The room is bright with large windows. There maybe some noise from vehicles and people on the street but it did not bother me at all even when sleeping during late mornings. I appreciate that there is a seal around the door because you may have other people smoking in the other rooms so the smoke wasn't coming in to the room.
Rest of the house - It has all the essentials that you need. Kitchen, laundry area, refrigerator, toilet, shower, and fast Wi-Fi. Note that the toilet is squat type, the one on the floor. I don't mind using it because it is not new to me but just be aware.
Location - It is my second time in Istanbul and I'm really glad I chose the Asian side/Kadikoy area this time. The location of the place is very central. Very close to everything. Supermarkets, restaurants, shopping areas, cafes, ferry terminal, bus stops, metro stations, high-speed trains, parks.