18 Stafford Terrace
The Victorian residence of satirical cartoonist Edward Linley Sambourne and his household, which is now open as a museum. The "aesthetic" interior design, preserved close to how the Sambournes would have kept it in 1899, features much Chinese and Middle Eastern-style furniture, a

The Victorian residence of satirical cartoonist Edward Linley Sambourne and his household, which is now open as a museum. The "aesthetic" interior design, preserved close to how the Sambournes would have kept it in 1899, features much Chinese and Middle Eastern-style furniture, a
Check the official site before travelling; hours and prices can change.
More museums

Sir John Soane's Museum
Free, tiny, deranged — Soane's own house preserved exactly as he left it in 1837.

The Wallace Collection
Free national museum in a Manchester Square townhouse — armour, Boucher, the Laughing Cavalier.

The British Museum
Free, vast, civilisationally heavy — go for one room, not all of them.
Source: wikivoyage