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I took 4 tours in Istanbul. Haktan was by far the best one, to the point that at the end of my stay, I only booked tours by Haktan. He even has these kinds of walkie-talkie/earpods that facilitate listening to him even in crowded places like Grand Bazaar.
My experience was so-so. Tour guide was nice but very pessimistic and often discussed about money and the tips. Not much was explained about Turkish food.
Very professional and well performing guide. He is even fluent in several languages. Well worth the time and money 😉