I just tried it, @Sabine155, to see if I could help, and no luck. Same problem you are having - I paste the code and it publishes as blank space.
The Airbnb website has been especially bananas these last few days. I hope this means it is under construction and will emerge streamlined, user-friendly and functioning...
You could try tweeting a direct message about it to AirbnbHelp, if you want. I predict they will tell you, "The developers are working hard to get this fixed." I know they have been telling me that since August about another known glitch.
I'm going to take a look at the code tomorrow to see if I can fix it myself. I will definitely update here if I figure it out.