In China you are legally required to go register your location with the police though. It's a bit different than lying to the building doorman or whatever.
I just finished staying in an airbnb for a month in China and didn't have to go to the cop shop. I've now just rented an apartment and did the registration no issues, they didn't highlight any gaps on my travel record so I assume it was all above board.
According to the law, you have to register with the local authorities. Technically a law was broken, unlikely it will be used against you unless they make it a prerogative.
Yes, I believe I was registered. Airbnb takes a copy of my (and any fellow friends staying with me) passport and does a few extra checks compared to stays I've had in Australia. Having said that I was staying in a pseudo-serviced apartment so it may have just been a normal hotel that was advertising on Airbnb.
