We stayed at Kaan's place for a week and absolutely loved it :) The apartment is exactly as described, it has all you need for a comfortable stay, plus a balcony with a fantastic view. Kaan was quick to respond and very helpful.
The area is not the best, however, I thought it was pretty safe, quiet at night and we had no trouble at all. We didn't want to live in a touristy place, but live like locals do:)
A word of warning, you will have to walk a lot! Up the hill to the metro and then to reach the trains, the distance is considerable. Again, it is something we were aware of, and wanted to keep fit after eating all that delicious Turkish food 😎
There are plenty of cafes and takeaways in the area, Trump towers shopping centre is about 8 min away (there is a back entrance from the bus station if you want to avoid climbing that hill). There is a big supermarket in the Trump tower, where I could pay with a card.
It was a great way to experience Istanbul!