My wife and I missed our ferry back to mainland Italy and got lost on the way to Florence. When we arrived (yes, it was late, but unexpected...which can happen while traveling), the host screamed at us and threated that unless we pay them an additional fee in cash they would not let us into the unit. At this point in the night we had no option. Their behavior was exploitative and dishonest.
Additionally, the mattress was extremely uncomfortable and the whole unit smelled musty and old. It was far from a pleasant stay. Even without the incident of extortion, I would not recommend this Airbnb.
The host is in the wrong business - they do not offer hospitality to travelers.