Hi! I an Italian living in Berlin since 2006. As every normal Berliner, I also work in the media business as a journalist - although my main occupation is that of University researcher. I love this city and... trust my knowledge about it!
Dear Linda, unluckily the apartment above ours had to be renovated and this resulted into a crack in the ceiling of the bathroom. The material falling down has been - as you correctly mentioned - plaster, and there has never been any structural problem impacting your safety. The crack has been done to water leaking from pipes being replaced. As for any other issue, as made clear during check in, guests are welcome to call us to solve any problem they may face. Thanks!