My family and I had a wonderful stay at Mahmud's place! Located in the "Old City", Sultanahmet area this apartment was very clean and comfortable for the 4 of us. The rooms were decent sized with each room having a full bathroom. The pictures Mahmud posted is a pretty accurate reflection of the apartment, which isn't always the case. The only thing I'd mention is if anyone has a lot of luggage or any disability with walking, the apartment only has stairs and no elevator. There is one flight of stairs to get to the apartment.
What sets this place apart is the host. Mahmud was so gracious in helping us load our luggage in the apartment, giving us tips on where to eat and what to see. He also made himself available to us with any questions we had or any help we needed in arranging taxis. He also provided us with breakfast in the fridge when we arrived and filtered water.
So if you are looking for a place in the Sultanahmet area I would definitely recommend this place to you!