Hotel between saint-germain-des-prés and montparnasse. Hôtel Louison in the 6th arrondissement of Paris. Treat yourself to an authentic getaway in the heart of Paris' Left Bank. In the 6th arrondissement, a short walk from Luxembourg Gardens, the Hôtel Louison reserves a thoughtful and courteous welcome for you: in this old royal family residence, you will feel at home.