Duplex apartment set across the fourth and fifth floors in South Kensington

Entry is on the third floor, where a private staircase leads to the apartment; there is also direct lift access. A large living and dining room on this floor is punctuated by three large sash windows framing leafy views of verdant tree canopies. In the next-door kitchen, sleek minimal cabinetry conceals appliances and reflects light back into the room. A double bedroom and powder room complete this level.

A staircase leads to the fifth floor, where three further bedrooms are located. The mast...