Set of four hardcover books on decorating. She loves fresh flowers, antiques, and a country-cottage aesthetic. He goes for organic elegance and urban glamour. Leslie Allen’s passion for beauty and collecting fueled a 25-year career that began as a stylist for clients like Martha Stewart and Ralph Lauren. In 2012, at 18, Sam Allen (now 20) was the youngest designer ever to take part in Albert Hadley’s “Rooms With A View” showhouse. But this Connecticut-based mother-and-son interior-design duo’s aesthetics overlap, and play off each other, in the best possible way.