Our driver Antonios and guide Konstantinos Konstantinidis were absolutely wonderful!!! Stan spoke excellent clear English and took us on a walking tour through Oia and the downtown areas, we also visited the red beach! We then around the island. We had a large group of 21 and he was extremely patience with our group... especially the teens and elders in the group. They were both prompt, professional and awesome. Konstantinos really knows his stuff. Very detailed, but not at all boring. Energetic and engaging.
I highly, highly recommend.