This sometimes slow, but interesting, movie has a number of strengths, most notably its characters, writing, and settings. The cast also features some fine performances from Ava Gardner, Humphrey Bogart, and Edmund O'Brien. The 'contessa' herself is undeniably the center of attention, but there is also much more to appreciate.
Gardner does well in personifying Maria, a character with an unusual mix of earthiness and innocence. The symbolic contrast between wearing shoes and going barefoot seems at first to be a rather obvious device, but as the character is developed, it gradually takes on more meaning. Gardner, with a lot of help from the Joseph Mankiewicz script, is convincing amidst Maria's changing fortunes in love and in her career.
Bogart is an ideal choice to play the director, whose own nature has an unexpected combination of world-weariness and integrity. And O'Brien gets one of his very best roles, as a press agent who is largely a parasite, but who turns out to have a couple of interesting things inside of him.
On the surface, the story is a relatively simple tale of a young 'discovery' and of what happens to her after she finds sudden fame. Yet the contrasts and conflicts among the characters, and the contrasts between them and their surroundings, make for plenty of good material. The multiple narratives and the dialogue help considerably in bringing out many of these possibilities. It's an interesting and effective movie that makes its characters come alive, and allows you to spend a couple of hours in their world.