I have had a negative experience with a host in Munich.
I booked at room near Oktoberfest for $600 for the days of Sep 19-23.
The host realized they made a mistake with pricing and asked me to increase the rate. I denied.
Then the host cancelled my reservation.
So I re-booked at the same rate of $600.
The host cancelled again.
Repeat 2x more.
The host lost the option to rent for those days.
Upon checking back a week later, I see that AirBnB removed the penalty and the host can offer the same days again.