First, I think that in most people's minds here Netherlands= Holland= Amsterdam.
The stereotypical Dutch person is very jolly and friendly, but not very sophisticated. We think of the Netherlands as a very rich and peaceful country with no enemies, but not threatening the way Germany or even Spain can be.
We understand that people don't really all wear clogs and live in windmills, but I think many do falsely believe that everyone smokes cannabis regularly.
The Netherlands are sometimes confused with Denmark.