My mother and I just took a private tour with Saban of Istanbul and he was fantastic. He was super friendly, knowledgeable, and well versed in the vast history of the city. He met us at the hotel and was punctual. Whenever we had questions or asked for suggestions, they were excellent. He always gave us more than enough time to explore and accompanied us. He also was super flexible when we wanted to eat lunch or take breaks. He also helped us when we went to the Grand Bazaar and Spice Bazaar with buying whatever we needed. I would recommend him to anybody doing a private or group tour in Turkey.