Set on a desirable block in the heart of the M Street neighborhood, 5446 Mercedes offers a thoughtful two-story layout with flexible living spaces and a rare guest quarters above the garage. The main home features three bedrooms upstairs, creating a private retreat separate from the home's entertaining spaces below. Two inviting living areas provide versatility for both everyday living and hosting, while a dedicated office offers a quiet work-from-home option. The updated kitchen flows seamlessly to the deck and overlooks the backyard. A convenient powder bathroom serves guests on the first floor. Outdoors, a gated drive leads to a two-car garage, with a manageable yard that offers space to relax or play. Above the garage, a fully equipped guesthouse includes one bedroom, one full bathroom, and kitchenette with refrigerator-freezer, microwave, sink, and washer and dryer hookups ideal for guests, extended stays, or additional workspace. A rare combination of function, flexibility, and location; this property presents an exceptional opportunity in a highly sought-after area.