Istanbul is an incredible city with complex history and culture that deserves at least a few days of waking around to appreciate. I unfortunately had 2 days and Mertcan met the challenge of balancing time with context.  He did an excellent job of hitting all of the points of interest that I indicated at the time of booking, and he was also very knowledgeable about the history of the city. I would love to go back to Istanbul again and have a longer tour with Mertcan. Highly recommend!