It is law in Valencia, my problem is one guest cancelled and would not give his ID.
I cannot inforce the law if guest refuses and not sure what to do about it if they do. I send a email with forms attached well in advance of guest checking in and ask for copy of ID as well. Chasing them up is intrusive and I try to get it all done before they check in to save keep messaging them. I also suggest that they look at the Guardia civil website to see it is law, a little stressful, maybe Airbnb could put note on booking that this is required. Have put in description as well.
But cannot inforce do I send them down to the Guardia civil or just report they will not comply.