How important is it to stay in
Italy? If it is
work related then there's not much you can do. It's just that places like Pozzouli and Venice are not
cheap and maybe not so pleasant for a
liveaboard. If location is not such an issue,then you'll find adequate places in
France (if there is room) but definitely in
Greece. Cleopatra Marina in Preveza is 2300 euros pa and the marina in Preveza itself might even be cheaper. You can go to places like Benitses and get
mooring for 0 euros but no
water or electricity.
Winter accommodation on land might be less than 100 euros a week. There are some
ports that allow long term stays and provide electricity and
water for a fee usually 5 euros a day. There might be as good or better deals in the Aegean.