The location of the first cholera case in London in 1848 (see in red) is seen in Cruchley's 1846 map, living at 8, New Lane by Gainsford Street in Horsleydown (see in red), just south of the River Thames.

Source: G.F. Cruchley. Cruchley's New Plan of London improved to 1846, Cruchley Map Seller and Publisher, 1846.