Kadir's place is exactly what you see - simply beautiful! The view of the Galata tower from the living room is amazing. The rooftop views of the city are perfect. He was a great host, accommodated an early check in, and the place was spacious and exactly what my friends and I were looking for on this trip. The only issues I had - there are no elevators and walking up 6+ flights of steps was quite exhausting after walking up the steep hills to get to the apartment. No fault of his own, but an elevator would've been useful especially when you have luggage.
I would highly recommend Kadir's place! The location is wonderful, close to Karakoy and walking distance to the bridge and Old City. If I have the opportunity to go back to Istanbul, I would def. stay here. Also, the cafe literally in front of the apartment was a go to for us - they had an excellent menemen and were so kind.