We had a great day in Istanbul on a City of Sultan tour with Eren Bolek. He was knowledgeable and got us into all the sights with ease. His studies in history and architecture enhanced our tour. He helped us have fun shopping in the spice market. We couldn't have had a better day. His tour was so much better than any ship tour we could have taken and for a lot less money. Knowing how to get around helped us see so much in a shorter time, plus we travelled in an air conditioned mini van.