Olive Sea Travel was an amazing way to see Athens. We booked them for a full day private tour during a port stop in early June. We also added a private guide. They were simply wonderful. Our tour included the Temple of Zeus, the Olympic Stadium, the Agora, the Acropolis, the Acropolis museum, a drive by of some other important sites, other stops for photo ops, a coffee break, lunch, and more.
I really couldn't have asked for more from them. They picked us up promptly from the cruise port and whisked us on our way in a private vehicle. The guide was incredibly knowledgeable, and our driver was very friendly. They really knew which things to emphasize on the tour. Plus, it was great having our own airconditioned vehicle to come back to after each stop.
As we were on a cruise, they were very conscious of getting us back to the ship on time. Our schedule was juggled a little to maximize our time in Athens and guarantee we got back to the port before the all aboard time. I'd definitely use them again should I find myself in Athens.