Can I ask, did you read the full listing description prior to booking? The house rules form part of the listing description. All guest must read the full description prior to committing to any booking in order to avoid disappointment or financial lose depending on each host's individual cancellation policy.
I would suggest that you review the full details and if not suitable for your needs, that you contact the host immediately to cancel the booking while you might still be able to get a full refund; Airbnb will not return their guest service fee as it is requirement to read the details prior to booking.
Hope you get it sorted, Ama