I think the motto, "use it or lose it" applies here in Spain. We had a generator, some electric garden tools and a portable metal sided pool stolen two years ago. We were not living on the finca at the time and this stuff was locked inside the mobile home. We had left the place alone for about two weeks (the only time it was left for that long) and hey presto we got robbed.

So be sensible. There are no guaruntees, but I have yet to hear of a lived in place being robbed! (Like what happens in South Africa - they will carry your bed off with you in it!)