A young and shy girl Celestina arrives from her small home village to Rome to become a housemaid. Her inexperience and naivety causes her to change her employers quite frequently. As she is moving from one family to another she makes friends with other Roman maids and falls desperately in love with a handsome plumber Fernando. But Fernando isn't telling Celestina that he is already engaged to another woman.

Paolo Anselmi is a happily single man. He lives in a flat with a friend but is forced to leave when the friend gets married. He then goes to a boarding house where he flirts with a girl but ditches her when she proposes marriage. When he goes and visits his mother he finds out that she is also trying to find the right girl for him. Is he going to surrender this time?

Armando Conforti, his family and his friends have a business: they sell souvenirs near St. Peter's, in Rome, they change dollars, in short they get along.