We had a serious problem with the smoke detector, which went off in the evening, and it wasn't possible to stop the loud sound. I couldn't reach the host on her phone or email (granted, it was pretty late in the day). As a consequence, it became necessary to stay at a nearby hotel instead of the apartment for the night. We may have made a mistake by accidentally damaging the smoke detector while trying to deactive it, so it had to be replaced. The host entered the apartment the next day while we were away, and in the process threw away our yoga mat on the floor, probably mistaking it for trash.
Anyway, looking back now, I think this was basically an unfortunate situation where neither the host nor guest is guilty of serious misconduct, and both sides made some small mistakes. Could've happened to anyone, no big deal.
Apart from this, the apartment was fantastic! Great location.