How Airbnb Works. Click the green 'Book It' button on a listing to send the host a formal reservation request. The host will then have 24 hours to respond. (If the host does not respond in that time, the booking expires.) If you see a listing labeled 'Instant Book,' that means there is no messaging or approval needed. In this case, clicking 'Book It' will confirm your reservation immediately. When a host accepts your reservation request, you will be notified by email and provided with a receipt, an itinerary and the direct contact details of your host including the exact address of the listing. After your host accepts your reservation, you'll be charged for the stay. Reservation Requests It's a good idea to fill out your profile before you start contacting hosts as many hosts prefer to learn about potential guests. La Vallée Village - LA_VALLEE Village. Anywhere There's An Airport. BUG Europe - the Backpackers' Ultimate guide to budget travel in Europe.