We use a QR Code for WiFi logins for the guests. It is in a our framed instructions for WiFi login.
I just suggested having the ability to add pics of QR Codes so we can send it out to guests in our automated messages. Or if Airbnb would set up there own QR Code generator that will automatically put a QR Code along with hosts WiFi information.
Maybe you could mention this to the tech people as well.