Keats House is a writer's house museum in what was once the home of the Romantic poet John Keats. It is in Keats Grove, Hampstead, toward the edge of inner north London. Maps before about 1915show the road with one of its earlier names, John Street; the road has also been known as Albion Grove. The building was originally a pair of semi-detached houses known as "Wentworth Place". John Keats lodged in one of them with his friend Charles Brown from December 1818 to September 1820. These were perhaps Keats's most productive years. According to Brown, "Ode to a Nightingale" was written under a plum tree in the garden.