Still up for me, weird - I wonder if they're region-locking by IP address or something?
Up for me, visiting from Berlin, can't possibly be in my cache. Perhaps the GP forgot to add the ".com"?
Interestingly, the site appears to only change the location of the listing and leaves all the other details (host, reviews etc.) exactly the same. Modifying the ID randomly redirects to the real Airbnb homepage.
Oh interesting, does the listing show as in Berlin for you? I got it to show a place in a Swedish ski resort somehow when I was first clicking around and reporting it, but then that disappeared and I never saw it again.
The default is rooms/804806 with location given as Campo Pequeno in Lisboa for me, but the one you gave was claimed to be in London. Incidentally, that one also redirects me to Airbnb now; maybe it was automatically removed due to increased traffic.
Maybe it only supports Euros, so they just block non euro IPs?
The site could possibly could still be stuck in OP's cache