I was only at Yavuz's place for one night for a long layover, but it was an absolutely perfect stay. He arranged transportation to and from the airport for us and his housekeeper met us at the car and got us situated in the apartment. It was a very nice place and was the perfect location for a whirlwind visit. We were only a short distance from the Grand Bazaar, Hagia Sophia and the Blue Mosque, so we were able to pack a lot of stuff into our short stay. Next time we go back (and we definitely will!) I would definitely book here again.
Notes: the apartment is sort of tricky to find, there are a lot of hills and the apartment is 4 narrow flights up. None of that is a problem, but it's definitely something to note if you have mobility issues or more luggage than we did!