School Teacher in the House (1978) on Netflix

Plot summary

Luisa De Dominicis, a piano teacher in Milan, relocates to Lucca to be near Ferdinando Bonci Marinotti, a councilman who is running for mayor and makes moral values his campaign theme. She takes him for a bachelor who shares his home with his sick mother. The boys in her apartment building, meanwhile, decide she is a prostitute who pretends that her lessons are her trade, and the story passes to the older men who live there. They bore a hidden opening through the wall dividing her flat from the bedroom of Marcello Busatti, the son of the landlord, and watch her. Marcello falls for her and is torn about the job he thinks she has.