Overall i enjoyed the tour. He talked a lot about architecture, especially of the mosques which was nice. I learned a lot.
When it comes to the spice bazar and the grand bazar, he kept recommeding individual sellers and later we discovered, they didn't offer the best price. So be a little careful with his recommendation and always haggle at the bazars :) Also he recommended an exchange booth in the grand bazar, but there are better exchange rates on the asian side/further from the tourisric areas!
Overall I enjoyed the tour