Hi :)
Check out sailica.com, I've booked a boat in Greece there and everything went very well. Got a bottle of champagne as a gift, and though it didn't last long, it was a sweet thing :)
I hope you have made your trip. It would be helpful for travellers if you share the travel details:
1.Route
2.Transportation
3.Weather
4.Budget
5.Places to see
6.Tips for travellers etc.
Happy travelling.