We want on a three hour tour and it was extraordinary. Worth every penny. Our guide, Ismael Mert, was THE best guide we had in Turkey, and among the best guides we have had in all our world travels. He provided exactly the right amount of context for everything we saw, was patient with our questions, and kept us on schedule so that we could appreciate everything. He was extremely knowledgable about history. We did this tour on our first of three days in Istanbul, and it set us up for understanding so much while we were in town.