What a great guide and a wonderful person. We had a few handicaps as I ended up unable to walk when in Istanbul. He was very flexible and helpful in arranging for me to see two of the most exquisite sights by wheelchair. (And I had my small service dog with me as well).  Beyond personality, Metin has a significant knowledge of the history, dating far back to the origins of religion and other cultural aspects,  of Turkey.  I highly recommend Metin as a guide and resource  when in Istanbul. I only wish we had had more time with him.