London is an extremely cosmopolitan city. If you have lived in the city for any length of time, it is easy to take its ethnic mix of people living together for granted. Amsterdam, Paris may have sizable minority communities whose origins are outside Europe also, but you cannot compare these cities to London.
So if you are visiting Austria, prepare yourself for what could be a slightly disconcerting feeling if you have always lived in a place where every other person is of a different ethnic background. Do not let your own presumptions before you arrived in the country colour your views of the Austrians however.
