Don't know the company, but, Lefkas is a great jumping off point for the Ionian Islands. I preferred the Southern Group over Corfu and the north group. I've summarized our two week
Ionian bareboat charter that started in Corfu and reached Cephallonia on my blog. It's got a lot of detail that might be useful for your planning. Have a great trip.
Gaetano
Bareboatingtheworld.com