Sister's Coffee, located at 17 Rue Boulard, features a La Marzocco machine for crafting espresso drinks and offers a variety of slow extraction methods to enhance bean flavors. Opened in April 2025, this café operates seven days a week, making it a convenient choice for a coffee break or a work session. Prices include a €2 espresso or €5.50 flat white, with options for both sweet and savory bites available. Guests can enjoy outdoor seating when the weather permits, all within the artistic ambiance of Montparnasse.