Ali is the best! He is knowledgeable, professional, and fun to be with. We had a great time with Ali. We did a van and walking tour of the Istanbul neighborhoods, which was excellent. His knowledge of history of the area was remarkable. He recommended a neighborhood restaurant for our lunch, and it was wonderful. He was the best guide we had in our two weeks of travel. He books up fast, which I found out the hard way since I wanted to book Ali for two days, but he was only available for one day.