Whilst i see all the important reasons the owners have listed about the legal requirements, as a regular renter, I would think it is only polite to let the owner know, it is their house after all. The private rental market is all about developing trust between the owner and the renter and this has to work both ways. Transparancy is important for all.
We rented a villa a couple of years ago and my wife's sister and her husband came down from calafornia to stay with us for a few days, we kept the owner informed (before we left the uk) and it was no problem at all, we offered to pay extra but the owner didn't want us to.
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