I think Airbnb has such security features in place already.
If your select ' account ' from the black bar at the top of your home page, then select 'notifications' - you have an array of 'push notification' alerts to choose from , including alerts made to changes to any aspects of your account.
Selecting > accounts then > security - here you can see all sign in activity regarding sign-ins to your account and login notifications - turning this on means if anyone logs into your Airbnb account from a new browser, you will receive an alert.