There is nothing generic about this flat on Via della Scala in Rome’s Trastevere district. Beamed ceilings run above mint-green walls and vintage porcelain vases, and a terrace looks out over the historic Janiculum. The French-Italian owner embraces color, from magenta armchairs to a bathroom tiled in a blue the color of a sunny day on the Mediterranean. And her place can now be yours—she has started renting it out through onefinestay, a vacation home booking company that recently launched in Rome. To perfect your stay, onefinestay will make sure there are high-quality linens and toiletries, 24-hour guest services, and other hotel-like touches. It’s all par for the course at the company’s rentals, now available in London, New York, Paris, and Los Angeles as well.