Airbnb is the world’s favourite accommodation marketplace – it offers access to millions of places to stay in more than 191 countries, from apartments and villas to castles. Most of us are familiar with how it works but not everyone has tried it. If you refer a friend to Airbnb they’ll get $40 in credit to spend on their stay, and you’ll get $20. Convince them that they’d make an amazing Airbnb host and you’ll get $75 to spend on your next trip.