Leave a brutally honest review of the lack of sheets, towels, etc & that the Condo association told you this was an illegal Airbnb offering. Also, us the “report this listing” on the Airbnb website to report an illegal offering.

Contact Airbnb via Facebook & Twitter to report this problem (social media gets their attention)

On a personal note, if your sister does your Airbnb bookings, be sure the account is set up as a WORK account. Otherwise to have someone else do your bookings can be considered a third party booking and against Airbnb’s terms of service (meaning you broke their rules, they will not offer much assistance).