Flatbook is a relatively new start up that has been founded by a young team of entrepreneurs determined to solve the subletting problem. They take on sublets by guaranteeing the rent. The places they manage are rented out on short-term leasing platforms such as HomeAway and Airbnb.
Based out of Quebec in Canada, it is operating in 33 cities across Canada, the US and Europe.
Here is a video showing what they do.