Özay was a fantastic host from the get-go; he helped me with clear instructions on finding his place, even gave me some candies. He was always on-hand to offer help or advice via WhatsApp.
As for the place, it was clean and well-appointed. At first I had problems with the internet but Özay replaced the router and, I think, even upgraded the connection after I asked about it, so no problem in the end!
All-in-all it was a good private room from which I worked for a month, 8 minutes' walk from downtown Kadikoy and about 12 minutes out of Moda. Really a great location and good value for money!