Alan Turing was born in Warrington Lodge, a nursing home in Paddington London, on Sunday 23 June, 1912. The Colonnade Hotel now occupies that spot in Warrington Crescent, Maida Vale W9.
On what would have been his 86th birthday, 23 June 1998, an official Blue Plaque was unveiled at Turing's birthplace by his biographer, author of Alan Turing: The Enigma, Andrew Hodges.
Picture from here.
The Colonnade hotel is offering 10 percent reduction, until the end of the year (2009), on its 'Best Available Rate' to visitors wanting to stay where Turing was born, and where Sigmund Freud once stayed. See the brochure below and don't forget to quote 'neighbour' if you book:
The Colonnade -