The stay at deniz's place was rather comfortable.
The location is great in regards to public transportation and local attractions. It is close to a bus stop and 10-12 mins away from the train/metro/ferry stations that could take you directly to the heart of the European side. The street is a couple of blocks away from the heart of Kadikoy, the vibrant streets of Moda. Which means you could enjoy a calmer surroundings while easily reaching these areas.
The apartment is fairly equipped with amenities and a drying rack was provided upon request. They have a cleaning service for free which is why they don't provide cleaning detergents and tools in the apartment.
You get what you see in the pictures, however the apartment is used and you could notice some weariness here and there. That didn't bother us because we weren't expecting a 5 star hotel, and it won't bother you unless you were picky.
We had one main issue: apparently smoking is allowed inside, and due to that, the smell of smoke accumulated on the furniture over time, which gives the apartment a rather unpleasant smell that grows very evident when the windows are closed. But credit is given where credit is due, Gamze (Deniz's assistant) and the staff in general were very responsive and tried to solve any inconvenience in the best way they can.