At the end of 1921, Ezra Pound rented a ground-floor apartment at 70 bis Rue Notre-Dame-des-Champs [P] (southwest of the Luxembourg Gardens). Hemingway visited Ezra here often, and commented on the poorness of Ezra's furniture, home-made from rather rough material. Hemingway and Ezra boxed together in the apartment, and Hemingway would later claim that he taught Ezra Pound how to box, and Ezra taught him how to write. [mapRaspail]

August 1926, Hemingway isolated himself in Gerald Murphy's apartment on the fifth floor of 69 Rue Froidevaux [Q], at the southern edge of the Montparnasse cemetery (14th). He corrected the proofs of The Sun Also Rises, here, not answering the door for anybody. [mapMontparnasse] NB: Some documents have identified this as number 60, Rue Froidevaux.

Winter 1929, Sylvia Beach introduced Hemingway to the writer and poet Allan Tate, when Tate was staying at the Hotel Michelet-Odéon, at 6 Place de l'Odéon [R] [mapLuxembourg]
Ernest and Allan walked from Sylvia Beach's Shakespeare and Company at number 12 Rue de l'Odéon [S] to the Café Voltaire at the Place de l'Odéon. [mapStGermain]

Les environs de l'Odéon ont perdu leur ancienne physionomie ; les étudiants, les professeurs habitent un peu partout et ne se croient pas obligés de demeurer dans le quartier des Ecoles. Le percement des boulevards Saint-Michel et Saint-Germain a beaucoup contribué à ce changement. Beaucoup de vieilles rues ont disparu, les loyers ont augmenté, mais, pour les étudiants surtout, il y a eu cette manie de paraître, qui a décidé beaucoup d'entre eux à passer les ponts.