I must say that when we booked this 2 day tour, I was very concerned. The thought of my husband and I, alone no other tourists, being picked up by a stranger in a foreign country was slightly unsettling. To my absolute delight, all my fears were unfounded. We were picked up at the Port of Piraeus by the most personable guide, Konstantinos Vegas. Konstantinos not only escorted us, he allowed us the flexibility to spend more or less time at the various sites, as well as providing us with the history, mythology and current political climate in Greece. His passion and expertise made this an exceptional tour. My husband and I were able to experience Athens, Cape Sounion, Delphi and Arachova, as if we were visiting a relative or friend, unlike any of the other cookie-cutter tours weve taken in the past. Konstantinos took great care to be attentive to our desires and did not force a predetermined agenda. It was a thoroughly refreshing, informative and enjoyable experience. He directed us to restaurants with delicious and reasonable food and at our insistence ate with us, affording us additional time to learn more about Greece. We had such a wonderful experience, we are eager to visit Greece again and I have already recommended Viator and Konstantinos to friends.