My wife and I recently did this tour with Tansel. We were both really happy with our experience. Not only did the day include interesting and varied food items but it also served us as a great orientation tool for our next few days in the city when we were on our own. Tansel spent way more time with us than we had booked him for and explained the history and sights of the city in detail. We would highly recommend him for any istanbul activity.
It was great hosting Tushar. They were on a honeymoon trip covering many cities, including Istanbul. My wife joined us and we went around as if we were hosting friends from abroad. Positive, friendly and punctual. I highly recommend them.