Fun-loving Anna and her brittle lodger Mr. Kurtz are already living under the same roof as an old married couple. The balance of opposites threatens to tip when Anna's helper syndrome kicks in twice. Her friend Gundi, who has injured her knee, needs help with her everyday life and a barrier-free home, but she can hardly afford a new apartment on her meagre pension. Anna's ex Willi needs a place to stay even more urgently. Soon there is the danger of a senior citizens' flat share.

Anna and her lodger, Mr. Kurtz, have come to terms with each other in their shared flat. But both Mr. Kurtz's planned conversion of the cosy four walls into a smart home and Anna's feelings for a new acquaintance shake up their life together.