A decade ago a pair of San Francisco roommates decided to make rent money. The rest, as they say, is history.
Hoteliers such as Marriott, Onefinestay and Accorhotels are competing by offering luxurious home-sharing spaces.
The home-sharing market is poised to become a lot more competitive, following news that the world's largest hotel company, Marriott International, is entering the fray.
Just how do the super rich fit within the sharing economy?