You will hear "zwo" pretty everywhere, it's mainly used to sound more colloquial or to be easier distinguished from "drei" (three). (I just learned that it originates from the female form of "zwei" which lost that grammatical function)

For the same reason people will say Juno instead of Juni to hear the difference to Juli (June & Juli).

Most dialects nowadays are very watered down or even extinct. The original language of Hamburg was actually the stereotypical Low German, a literature language on its own.

The normative source for German pronunciation nowadays is a news show called Tagesschau which is produced in Hamburg.

That's why people from the north think they speak the best German. But there is no legaly binding norm defining the best accent. Germany doesn't have a culturally dominating center. (It's even not really clear what Germany is.)

And the more south you go the more "resistance" (to phrase is politely) against this northern standard.

For comparison, I've been told that the accent from the Midwest is considered very trustworthy in the US because many news speakers originated from there.

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