My first time using Airbnb.
Extremely friendly and responsive host - very easy communication.
Flat was clean and well equipped.
Quiet.
Well located for supermarkets.
Shower pressure was low, but I think it's just an old building.
Location of flat was perfect for my needs (which is why I chose it, even though it was quite a lot more expensive than other options).
Ostia area - surprised, badly maintained pavements, lots of litter and dog mess, generally just not clean, maybe they spruce it up for the high season?