There was a bad stagnant water/mould smell in the kitchen,
Water on the shelves of the fridge.
No extractor fan in the bathroom.
Collecting the key from another location is not a great way to begin your trip.
The road noise was very loud, not just traffic, people hanging around chatting and laughing.
It is directly under a flight path and there were approximately 3 flights over head every night. I bought earplugs but could still hear it.
If the windows were replaced this would improve the situation.
The power went out on the 1st night because we had "plugged to many things in", which in our defense was not that many things at all. Despite my insistence to the representative that I was not comfortable touching the fuse board, she said that getting someone out to fix it was not an option, relocating us was not an option either so I was forced to touch the electrics despite my discomfort so that I would have somewhere to stay that night.
Not the worst Airbnb I've ever stayed in, but definitely the one with the least concerned host(s).