The half-day we spent with Alex was the absolute highlight of our holiday. We began a 15 day Viking Cruise with a 2 night pre-trip in Athens. While many of our Viking excursion guides were excellent, none were in league with Alex. He has an extensive education and knowledge of Greece and truly made history come alive for us. Bonuses: no language issues, private tour for the 4 of us, comfortable van and a great driver. Plus: on-time pickup and return to our hotel and maintained a perfect pace for us. In addition, we were able to exchange messages in advance and Alex tailored our tour to suit. Wish we could rate higher than 5 stars.