Here is a unique and rare opportunity in coveted Swarthmore Borough (Wallingford-Swarthmore School District)! This solid, well-maintained, charming two-story cape-style Colonial is being offered for the first time in 43 years. Situated on a flat lot along a beautiful and peaceful street, 551 Marietta Ave. offers a unique and flexible first floor plan with endless possibilities. A covered entry welcomes you to a spacious living room with gleaming hardwood floors. Off of the living room is a bright den with a fireplace, built-ins, vaulted ceiling and two large closets. An adjacent FULL bathroom makes this room perfect for use as a first-floor primary bedroom suite if you desire. The bathroom has a large closet plus an area to add a washer and dryer! The first floor includes a freshly painted study or home office giving you a perfect, quiet retreat. A formal dining room with hardwood floors and a chair rail provides a delightful gathering space for special holiday meals. The adjacent kitchen features ample counter space, white glass-front cabinets, white subway tile backsplash and a large pantry closet. The kitchen exits to the driveway and carport, which is super-convenient for unloading groceries. A half-bath completes the first floor. Proceed upstairs where you will find three good-size bedrooms with hardwood floors under wall-to-wall carpeting, and a full-bathroom with vintage ceramic tile and a linen closet. One of the bedrooms accesses an insulated attic that is ideal for your storage needs. Don't forget to check out the finished "retro" basement recreation room with its period knotty pine paneling! The basement's unfinished area includes the laundry, utilities and storage. Outside there is a large carport and a tranquil backyard ready for your landscaping ideas. Through the years the longtime owners have made numerous improvements. A brand new roof was just installed in July 2024, giving you peace of mind for years to come. Other improvements include a newer gas heater, central air and replacement windows. And let's not forget the location.....You are an easy walk to the Swarthmore Town Center, Swarthmore College, nearby parks and the SEPTA Media-Wawa regional rail line, and I-95, I-476 and the airport and stadiums are minutes away. This is your chance to bring your imagination to make this lovely home into a show-stopper you'll enjoy for years to come! Don't miss it!