Nowhere in the world has more accommodation available on Airbnb than Paris. Now the home-sharing website that has transformed budget travel to the French capital is giving its super-deluxe hotels a fright too.

"The Paris market is going to get very difficult," said Didier le Calvez, managing director of the Bristol Hotel. Along with bosses of the city's other "palaces", he denounces Airbnb as a menace that enjoys an unfair advantage.