Hi Ian and Judy,
We spend a season jn Levkas marina and liked it very much. It is close to Levkas city which is a nice little town. We also experienced Cleopatra marina, which is cheaper, good but basic.
The big problem with that part of Greece is that the airport is closed for international flights from October to May (at least in 2009). As an alternative yoy could also check out Messolonghi Marina which is close to Patras airport and an hour bus drive from Athens.
Cheers,
Rink de Haan
Razor's Edge
SM2k #330 currently in Kusadasi Turkey