This is a great place. I stayed there for one month.
First of all, I would like to highlight the hosts' hospitality - Busra and Cemil. They were always ready to help if needed - suggesting what should I visit in Istambul, good places nearby to grab something to eat, they helped to plan my road to the airport and many more.
We mostly used English to talk, and Cemil and Busra are good at it.
As for the room - it's really nice. There is a comfortable bed with a good mattress, a table where you can work if needed, garderobe to store your stuff.
I really liked the location of the house - it's a lot of small shops around, it's just nice to wander around in the evening.
Transport is also not so far - ferry about 20 min of walking, subway - about 10. There is also a big shopping mall near the subway if you want to see a movie or buy some stuff.
Cemil, Busra, thank you!