I enjoyed the tour with Cem on the last day of my holidays. I highly recommend to do so very early within your stay in Istanbul. You'll see hidden corners, nice places for having dinner, you would probably never discover by walk. It'll give you also a good basis for orientation. Cem is a prudent guide, very polite, open minded. He is open for your needs: He just gives as much historic and background information as you like, waits for taking photos, etc. Top service: bike, parcour.
TOUR GUIDE RESPONSE: Thanks a lot for your excellent rating, Sascha. I hope that your words will persuade more and more travellers that biking in Istanbul is not only possible and enjoyable. I hope to see you again in Istanbul for another ride! All the best