In case anybody would like to have some good companies to quote on this I would recommed
http://www.intasure.com and Schofields. These are UK companies but I am sure anybody from anywhere is free to get a quote. Mine is for Santa Domenica Talao.
In fact I have just gone with intasure as they include earthquake insurance as well as rental cover, accidental damage etc. And because I got my sister a quote for her holiday home they cut the cost by about 16 Euros; simply for asking!
So, do remember to ask or say you were recommended. I don't receive a cut but it may benefit you. Schofields are good but don't include earthquake insurance cover without an additional premium, thereby making them less competitive.
Regards
Helena