If you are considering a tour company for a visit to Greece, we highly recommend Athens Insider. They arranged five activities for us, and we enjoyed every one of them. They took excellent care of us, both in preparing for the trip and during the different excursions.
The day trip from Athens was excellent. Our driver Yannis was outstanding — we had him as our driver for three days, and we enjoyed our time with him as much as the sites themselves. He was a careful driver, very considerate of us and everyone on the road around us. He helped us to get to know Greece and appreciate the warmth and hospitality of its people. While not a licensed guide, his insights at Napflion helped us know both the medieval site and the modern town. Throughout our time with him, Yannis added a number of little touches to our trip that made it feel very personal to us.
We also strongly recommend visiting Greece in November. We were fortunate to enjoy a week with no rain, mild temperatures, and virtually no crowds. To be able to stand in the ampitheater at Epidauros, or the throne room at Mycenae, with the unspoilt scenery behind, with not a sound and barely another person to be seen, made the visit so much more rewarding.