<|start_header_id|>assistant<|end_header_id|> Here's a rewritten summary with a more salesy tone: "Step into the epitome of London living with this stunning one-bedroom duplex apartment in the heart of Marylebone. This charming period building on Harrowby Street boasts a unique blend of classic charm and modern convenience, offering a rare opportunity to own a piece of London's vibrant history. With its south-facing aspect, sleek open-plan kitchen and reception room, and spacious double bedroom, this property is the perfect haven for those seeking a stylish and tranquil retreat in the midst of the action. Plus, with a long lease of 167 years, this apartment is not only a fantastic investment opportunity but also a rare find in a city where supply is scarce. Enjoy the best of Marylebone's boutique shopping, dining, and entertainment scene, as well as excellent transport links, all just a stone's throw away. Don't miss this chance to make this incredible apartment your own!"