We came to Istanbul hoping for the best and did find a lot of it. Check-in was easy via code, New York apartment seemed to be alright, freshly renovated, comfy with a nice grey interior. Sadly the heating wasn´t working. It was impossibly to get more than 15C. Our host was working on it directly but the handyman couldn't fix it and after two nights he offered to move down the steps to the Tokyo apartment. Same apartment but this time in light and warm colours. The heating was a problem there as well since we couldn't reach warm temperatures for ourselves. So every day someone came to "repair" it. When we came back we had 25C, turned the heating down and it instantly stopped working properly. This will probably be fixed in future, still it's been a downside for our stay.
One should also know that there's a club right beneath the sleeping rooms window. If you do not plan to go out on Saturdays be aware of the possible loud people under your window.
The bed was comfy, two very high and stuffed pillows on each side. If you don't like that, better bring your own.
Since I guess the whole heating problem will be fixed and a manual will be provided I recommend the apartment for the stay since it's very clean, has more than enough space for two people, is right in the middle of the city and has a fast responding host.