Though raised at 69, Rue de Courcelles, in Paris, Antoine continued to oversee the Bibesco estates in Craiova until after World War II.

As a young man, his mother, Princess Hélène Bibesco's celebrated Paris salon gave him the opportunity to meet Charles Gounod, Claude Debussy, Camille Saint-Saëns, Pierre Bonnard, Édouard Vuillard, Aristide Maillol, Anatole France, and Marcel Proust among many other notables.

[1] Both his father and mother commissioned artworks and music (most notably Edgar Degas and George Enescu) and Antoine continued this family tradition, particularly through his friendship with Vuillard.

In 1936, after Romanian Prime Minister Gheorghe Tătărescu removed Nicolae Titulescu as Foreign Minister and recalled nearly all Romania's diplomats, Prince Bibesco had the unenviable responsibility of reassuring the United Kingdom and France that Romania was not slipping into the grip of fascism.

"He had three tombs in his heart", Enid Bagnold wrote in her Times obituary, "which I think he could never finally close—of his mother, his brother Emmanuel and his wife."