We crowd-sourced the answer on Twitter, so it was really a group effort. For London it was basically a local IDing the location, then for Holland several people noted the lamp posts were distinct enough to narrow down the locations, then it was just a matter of looking.

[In the] Paris photo the Suzuki sign was ID'd, then it was basically searching for Suzuki dealers in Paris and checking the locations on Google Street view.

For the Germany image there's an advertising board there, so the locations could be narrowed down by looking at the company who owned the board, and their site lists locations of their advertising sites, which again narrowed down the locations.