There are four workable ways to invest in Airbnb apartments.
Buying to let
Renting to rent
Managing property for a commission
Marketing property for a commission
Depending on your financial situation, some of these strategies will not be feasible for you.
Suppose you have money or access to borrowing, for eg. The logical choice would be to buy and let; if you have up to one year's rent advance, you can rent from an investor and sublet(rent to rent). If you have no money to rent, the third option of managing other people's short term apartments for a fee(usually 10-15%) of the rent, is more suited to you. A manager will be responsible for the upkeep of the property and for the guests and any damage they may cause.
Another way you can enter into short-term property investing is by turning yourself into a marketing platform for apartment owners. This is the sole business model of booking sites. You can be a local point of call for short stay services apartments, recommend places and get up to a 10% commission for every guest you bring in. Some booking sites charge up to 17% for this service.