Timeless Airbnb interior design trends that boost guest repeat rates include Scandinavian minimalism, biophilic design inspired by nature, and modern farmhouse warmth. These styles focus on comfort, natural light, and clean, harmonious aesthetics that appeal widely and age gracefully. Guests connect emotionally with inviting, uncluttered spaces, encouraging them to return. Layered lighting, cozy textiles, and functional yet elegant furniture support these trends, making them effective investment choices for long-term booking stability.