If you loved Der Untermieter, try Magnolien aus Stahl
Eine Brücke zwischen einem Film, den du schon gesehen hast, und einem, den kaum jemand kennt. Das teilen sie, und was der zweite macht, was der erste nicht macht.
Was sie teilen
Both films are directed by Herbert Ross, and they both carry the bittersweet, tender mood tags, and they sit in Comedy / Drama / Romance territory. If that's the register that drew you to Der Untermieter, the second film will land in a comparable space — through a different lens.
bittersweettender
What Magnolien aus Stahl is
The briefest synopsis might call this "a film". Truvy's beauty parlor in Louisiana is the go-to spot, where a group of women gab as they get their hair done. It is indeed based on a play.
Ask 
ChatGPT
Claude
Grok
Le Chat
Perplexity
for a deeper bridge
ChatGPTClaudeGrokLe ChatPerplexity