Mehmet was a great host and the apartment is in a fantastic location if you want to be near the center of nightlife in Istanbul. We found that Sultanahmet was very quiet at night and were thankful to be around the corner from Taksim, where all the restaurants and stores are open late.
We (4 of us) arrived at 2 am to the apartment and Mehmet was there to great us and very friendly. He provided us with water for our whole trip and gave us fantastic suggestions for places to eat and see while in Istanbul. He was very easily reachable and responsive via email.
The apartment was, as it says in the description, cozy. 4 of us stayed there for 5 nights and it worked very well as a home base, we even cooked dinner there the last night! The beds (all 3) were very comfortable. Also, and this was very important as we didn't have phones that worked in the Istanbul or computers, the internet was very fast.