Contacted Kadir after positive reviews here. We had a 1 day stay at Istanbul and he arranged everything airport pick up, drive to Centre to meet our guide Gorkug.
What followed was a tour of all the main attractions Hagia Sophia, Blue Mosque, Grand Bazaar and going through some hidden gems until meeting our car to take us for dinner with views over the Bosphorus.
Gorkug was very friendly, knowledgeable and easy to interact with. He surely knows his way around this amazing city.
Driver for the day was also professional and he waited for us to finish dinner before taking us back to airport for flight.
Highly recommend this company for Istanbul guided tour.