@Max262you dodged a bullet.
This guest may have had issues paying. Airbnb will cancel without explanation if a guest's card is declined or fraudulent. Consider this a blessing.
We had a young couple stay some time ago who had a declined card. For whatever reason, ABB did not cancel. I spent MONTHS and dozens upon dozens of phone calls to Customer Service and the guests to coordinate the pay out. It was a few hundred dollars and the time I spent on it was worth far more than I was owed but I was determined. The guests knew there was a problem with their card but they figured ABB would catch it and ask for a new one before they stayed. They were very cooperative and provided a new card but it still took months, literally months of my complaining to get paid. Other hosts have said the same thing-- there are many threads on missed payouts due to ABB glitches.
Now if I see a cancellation by ABB I count myself amongst the lucky. Trust me, this is the MUCH preferred alternative to having to chase down CS and shake down your guests for payment.