Paris is organised into 20 numbered arrondissements spiraling outward from the centre, and understanding roughly where they sit does more for your trip planning than any neighbourhood name alone. The Marais (3rd and 4th arrondissements) puts you in one of the city's most walkable historic districts, close to Notre-Dame, the Picasso Museum, and a dense concentration of cafes and boutiques. Saint-Germain-des-Prés (6th arrondissement) offers a similarly central, upscale base on the Left Bank, near the Luxembourg Gardens and a long-standing literary cafe culture.
Montmartre (18th arrondissement) delivers a different, more residential and artistic character around Sacré-Cœur, with steep, charming streets that trade some central convenience for atmosphere and generally lower rates. The 7th arrondissement, home to the Eiffel Tower, offers a quieter, more affluent residential feel, while the 1st and 8th arrondissements (near the Louvre and Champs-Élysées respectively) put you at the absolute centre of classic tourist sightseeing, at premium pricing to match.
