Two major negative experiences:
After I booked the reservation, the host asked for an additional $850 for us to keep our reservation. We could have cancelled, but by then there were much fewer options. The host claimed it was the system’s fault for not increasing prices over new years, but I think the host should have accepted the loss.
One night our group arrived home late to find a stranger in our room. It was a terrifying experience, but luckily no harm came to us. The stranger was confused and meant to enter the apartment below, also managed by the host. Long story short, the host denied any responsibility for the stranger having access to our apartment, and we knew that we always locked our door, so the host provided the stranger with a code to our place. The stranger admitted to us that the host had given him a code to our place, which he used to enter our place. Luckily we were able to receive a partial refund after AirBnb investigated the incident.