Hugh Grant's house with the blue doorMap | Google Earth | Satellite Image
Address: 280 Westbourne Park Road, Notting Hill, London, England, United Kingdom
The House with the blue door is of course Hugh Grants house in the film. However, the owners didn't like the attention gathered from having their home featured in a major motion picture and so now looks nothing like it does in the film. It's now been painted black and has a different door surrounding.