Yasin did a fantastic job providing my wife and I a custom tour around the old city of Istanbul. He was clearly knowledgeable and communicated numerous interesting facts and information about the sites we visited. He was patient with us as we asked numerous questions and he was incredibly helpful in recommending other things to see as well as provided great referrals to restaurants and other destinations. We really couldn't have been more pleased. I'd recommend him to anyone visiting Istanbul who is looking for a truly professional and personable guide.