Have NCed for this as could be identifiable. Also posted in travel.
Just back from a week in Spain in a self catering villa. The villa looked stunning, and would have been perfect if anything had sodding worked!
Anyway, after a week of multiple problems - toilets/showers/washer/dryer/dishwasher/cooker not working, problems with transfers, things not being as stated etc - it ended in two of our party receiving electric shocks from the water supply! 

It turned out every socket had been live and any of us or our children could have been seriously harmed at any point.

So we will be pursuing the matter and feel a significant (if not full) refund is in order as our stay was so beset by problems. Can anybody offer any advice or point me in the direction of helpful sites?
I'm guessing that in the UK we could report the company to somewhere, but as the property is in Spain I have no idea on where to start.
Obviously, we can contribute damning reviews on Tripadvisor, Holiday Lettings, Owners Direct etc, but really we want our money back!