We were 3 people who stayed at Yavuz's apt for 1 week. Since we stayed 7 nights, we were provided a free ride from the airport. The house is as described with all needed amenities for a trip. Location is good (10-15 min) walking to Sultanahmet.
We had little interaction with Yavuz's friend as he was out of town but he was available if we needed him. Lots of small places to eat, and cheap. Overall the experience was really good.
One thing to notice though, during the night, the neighbourhood is very loud. People, kids yelling, talking. If you mind, you should think twice.