The trip we did was the 11-day Greek Island Hopper that included all transfers and high speed ferries. I would have given this trip a 5-star review had it not been for a bad experience at the first of four hotels we were booked into; the only hiccup during the entire 11 day adventure. The first hotel we were booked in, the Titania, did not have our reservation; after traveling for 15 hours this is not the information you want to hear at check-in. We were eventually provided a room that was small and very dated in appearance. Our view was of an interior utility "courtyard" full of pipes, ductwork and rusty ladders. In our opinion GVV should stop using this hotel. This hotel also did not have record of our final night reservation, good thing we inquired about that ahead of time.
Having said that; this is the third trip we have booked with GVV and we will likely use them again because the first two trips to Iceland and Grenada were great and the rest of this trip to Greece was fabulous.
The other three hotels; the Kamari in Mykonos, the El Greco in Santorini, and the Megaron in Crete were excellent. The Megaron was the best of all, 5-star luxury with a stunning roof top restaurant and pool.
All the transfers to and from the hotels, ferries, airports that were included were excellent. The Tour of Athens including the Acropolis and Parthenon was fantastic. We can highly recommend this trip, especially if GVV does not use the Titania hotel in the future.