We visited Greece in July 2021 and went with Olive Sea Travel for a private day trip to Delphi. Alex, our driver, was an excellent host and guide.  There were six in my group and he ensured all our needs were accommodated, flexing the stops to what we desired. He chose a superb restaurant in Delphi overlooking the valley that was just phenomenal - truly a lunch that we'll never forget! I would definitely use Olive Sea again when visiting Greece. The only suggestion I have is that the vans have seats that recline; the van we traveled in was new, clean and nice, but when you're spending 4-6hrs in a van it would be nice to be more comfortable. Suggest a Mercedes Sprinter next time. Overall though, thoroughly enjoyed our day.