Not Pauline Kael’s review published on Letterboxd:
Charming. This is the picture that made Audrey Hepburn a movie star. Probably no one could have brought out her skinny, long-necked gamine magic as winningly as the director William Wyler did; his calm, elegant style prepares the scenes and builds the character until she has the audience in thrall, and when she smiles we're all goners. She plays a Central European princess on an official tour of Rome. The princess flies the royal coop and has her first experiences of freedom with an American reporter (Gregory Peck, who is at his most animated and likable) and his photographer-sidekick (Eddie Albert). The plot is banal, and the movie is no more than a Cinderella-style romantic comedy, but it's enough. (Children adore this fairy tale about a modern princess.) With Harcourt Williams, Hartley Power, Margaret Rawlings, and Tullio Carminati. Much of the film was shot on Roman locations. The cinematography was by Franz Planer until he fell ill and Henri Alekan took over; the music is by Georges Auric; the editing is by Robert Swink. The story is credited to Ian McLellan Hunter and the script to him and John Dighton, though Ben Hecht also worked on it, at one stage, and Ennio Flaiano and Suso Cecchi d'Amico are said to have rewritten it for Wyler when he was in Rome. (And Hollywood folklore has it that Hunter, who picked up an Academy Award for his contribution, may have been serving as a front for the blacklisted Dalton Trumbo.) Paramount.