Bismark Straße is often one of the main streets in major cities in Germany which means Bismark Street. Streets which were named after villains were renamed. If that's an acceptable answer for you.

Personally i think he is regarded as the responsible person for the german unification which is always regarded positive in modern german history

There is a tendency in Germany to avoid labeling political and historical figures as "heroes" or "villains". In fact I can't think of a single person besides Hitler who would get an undisputed label, certainly no politician of the more modern era.

Looking back at my education, I remember being taught about Bismarck at 11th and 12th grade, i.e. at around age 17. What stuck in my memory were his Sozialistengesetze and the fact that he was responsible for three (two?) wars, so a rather negative legacy. Then again, I do remember him for being essential in the unification of Germany, for being not quite the maniac that Wilhelm II was and for the implementation of social laws.

If my view of him is typical of my generation, which I think it is, then I'd say we have a mixed perception of Bismarck, neither villian nor hero, simply a successful politician.

I enjoyed the German education, and I don't remember being thought anything that would make him a villain. This is not supposed to be an academic answer to the question, but rather a followup question to what reasons there are that would make him a villain.