The host is really good, great communication, the apartment is nice and just like at the pictures. The area is very close to everything as much as it can be in such a huge city as Istanbul is. Couple of warnings though. Many people already wrote about the stairs, the host will warn you about them, and I have to write about them, they are narrow and there are lots of them, also if you are taller then 1 m 75 sm, watch for your head, I bumped mine twice on my first ascend. It can be cold in the apartment in the end of October, and in our case conditioner didn't help with that.
I would definitely recommend this place for your trip to Istanbul.