It is a pleasant stay at Ergin’s home. The room is what it is exactly described in the listing. It is about 5 mins walking to the Acibadem metro station, and 20 mins walking to the center of Kadikoy, and the museum is right in the corner.
Ergin keeps the apartment extremely clear and organized, and you can use the kitchen and facilities in the apartment, he has a work room where there is a keyboard and guitars, Ergin plays the music in that room, you can join if you want ;)
He is not just a host, but also a good friend to me, he picked me up and helped me move my luggages, and helped me go to banks and solve the visa problems (sorry to bother him so many times).
He is ok that I brought my friend to the apartment (just need tell him in advance), and he is open to try different food with us, we had much fun even though we might have some language barrier.
I would highly recommend that you stay in Ergin’s when you come to Istanbul.