Inside Europe: My home is your castle

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It’s never been so easy to stay in a French chateau. France has – amazingly enough – 43,000 castles. Most of them are firmly out of bounds for the hoi polloi but now, thanks to the rise of on-line house-sharing, many chateau owners are finding that renting out rooms is a good way to pay for the upkeep of their properties. John Laurenson reports.