This is a great apartment in a wonderful part of Istanbul. The city is huge, and it can seem overwhelming to a visitor who doesn't know it well. Cihangir, which is sort of the hipster Brooklyn of Istanbul, is full of cafes, shops and restaurants, and feels like a small, tight-knit community despite having a large foreign population and being close to touristy areas like Taksim Square and Istiklal Caddesi.
The apartment itself is very well maintained. Unlike a lot of Airbnbs, everything -- the washing machine, the air conditioner, etc. -- worked. The shower had plenty of hot water and good pressure. The bed was comfortable and didn't hurt my back. There were no glitches to speak of, but whenever there was a minor problem, Cenk, the owner, responded almost immediately and took care of it.
The apartment also was nicely decorated with pleasant paintings on the walls and light fixtures that had a Turkish/Near East feel. This was a welcome change from some of the ghastly, over-the-top furnishings that Airbnb owners often put in to try to distinguish their places from others.
The only note of caution I would add is that the neighborhood, like much of Istanbul, is very hilly. It's hard to avoid a fairly steep climb in the morning. I didn't mind it, and I actually began to appreciate it for helping to get me in better shape after a month, but someone with a physical disability or other health issues might find it too much.
To sum up, it's a great apartment, Cenk is a great host, and I definitely want to stay there again the next time I'm in Istanbul.