Good idea to put "guarantee" in scare quotes. If Airbnb had an actual guarantee that landlords or tenants could depend on their terms and conditions would not be as scary as the are: https://www.airbnb.com/terms
Note especially this heartwarming section: "You acknowledge and agree that you and Airbnb are each waiving the right to a trial by jury or to participate as a plaintiff or class member in any purported class action or representative proceeding. Further, unless both you and Airbnb otherwise agree in writing, the arbitrator may not consolidate more than one person's claims, and may not otherwise preside over any form of any class or representative proceeding."
Note especially this heartwarming section: "You acknowledge and agree that you and Airbnb are each waiving the right to a trial by jury or to participate as a plaintiff or class member in any purported class action or representative proceeding. Further, unless both you and Airbnb otherwise agree in writing, the arbitrator may not consolidate more than one person's claims, and may not otherwise preside over any form of any class or representative proceeding."
What could possibly go wrong?