If it was NDNs I'd be unreasonable, but I share a hallway with my two upstairs neighbours and I store my bike in the hallway, and post (eg bank statements) comes into the shared hallway too creating an identity theft risk.
I only found out by accident through the other upstairs neighbours that their flat is being left on Airbnb.
AIBU to think she could at least have mentioned she was planning to turn her flat into an AirBNB?