I've used Airbnb dozens of times without any issues and unfortunately this is the first critical review I've had to leave.
Positives:
Room is a decent size. Shower is good. A basic breakfast is provided each morning. Great location.
Negatives:
In general, the place is decent value, however I found the host lacked warmth and at times came across as rude. In particular, one morning she was ranting loudly at the cleaner, and on the morning I was going to check out, rather than asking me how my weekend had been she just walked in and said: "You're leaving, no?" I did not feel welcome there. In addition, most nights she had her TV on loud until the early hours, then early in the morning she'd make a lot of noise in the kitchen, so you may need earplugs. The floor and bathroom also were not very clean at times.
If you want to see if I'm an overly critical reviewer or a difficult guest, check other reviews I've given and those from my previous hosts. They're all 100% positive.