Greece was good
I have just taken my Cessna 172 to Greece. Inbound and outbound for fuel and customs was via Kerkyra (Corfu). Both times an efficient and easy stop with good service. No problems.
I then went on to land at the Athens GA airfield--Megara. A military field but with loads and loads of GA aircraft there. PPR required but quick and easy and no problem.
No security problems at all. A delightful airport where I parked for 4 days whilst on holiday.
On return all smiles and when I asked about landing and parking fees was told. There is nothing at all to pay..!! Have a nice flight back home..
So I would encourage fellow GA aviators to make the trip.