Sweet and serene on the sunny side of Marlborough St! Set within an unusually wide corner building, 363 Marlborough boasts expansive street frontage and rare double exposures that flood the space with natural light. Just one flight up, Unit 5 features a smart layout with a spacious living and dining area anchored by a wood-burning fireplace and built-ins, plus an efficient and updated kitchen with in-unit laundry. The king-sized primary bedroom enjoys a corner exposure, large custom closet, and striking views, while the generous guest bedroom offers a bay window overlooking Hereford St and a built-in desk for versatile use. Nearly every window frames sweeping boulevard-style views of Marlborough St and the Back Bay skyline, including the Prudential Center and Hancock Tower. With central air, 10-ft ceilings, hardwood floors, and a well-managed, pet-friendly association, this home offers timeless Back Bay living just moments from Newbury Street, the Esplanade, and the Prudential Center.