We met with Serkan and started exploring Istabnul!!! He was prompt, courteous, full of knowledge about everything, professional, gracious and fun!!!!!  We had planned only 4 hours but we enjoyed him and the walk about tour so much we finally let him escape after dinner:)  We saw so many sites and learned so much!!!  I had posted a review earlier but it got lost so I am hoping this one is seen.  We highly recomment Serkan as your guide. He was fantastic and Istanbul was excellent!!! Cindy and Mike, Crete, Greece and San Diego, CA