This is the Cambridge people picture: quiet, leafy streets, brick sidewalks, and Harvard and Porter Square on either side, each with a Red Line stop. Between them, Mass Ave is lined with cafes, shops, and restaurants, where dinner at the bar at Giulia and a slow walk home with a cone from Honeycomb Creamery can be an ordinary Tuesday. Across the street, the Radcliffe Quad is the backyard, a wide green lawn for running the dog and trading hellos on the morning walk. The condo lives up to the location. Second floor of a 1925 Harlow building, 1,021 light-filled square feet, two exposures. The living room has a wood-burning fireplace and built-in bookshelves; the updated kitchen has a gas range and room to cook, with a proper dining room alongside. Two bedrooms, both generous and bright. Professionally managed and long established, the building has landscaped gardens, laundry, bike and private storage. The condo fee includes heat and hot water. Just enough city, just enough quiet.