I had a pleasant stay at Kursat's place for 5 nights. He was very quick to respond, helpful, kind and friendly.
The flat is located in a really nice central area 5mins walking to Istiklal, and 8mins to Tunnel and metro station.
Amenities are all decent. The bed and pillows are comfortable for a good sleep. The closet is big enough to hold 2 suitcases of clothes.
All in all, this turned out to be a great deal for the cost, I would easily stay again!