I have never been to Berlin but I stayed in Vienna for a week with my friend and I like the environment. Definitely very different from Mexico.
Besides. I like the cheese there lol.
Germany to me is a little lesser attractive because the busyness is almost the same like Asian countries. I am not sure about Berlin but Frankfurt sure gave me a déjà-vu feeling of Singapore.
The good.... I still vote for Austria although they are almost the same.
And the interesting part of Vienna during Summer is you start work early and you finish work about 4:30pm and then, if you're a picnic and community person, you'll see Austrians love their after work picnic and family time.
At least that's in Vienna.
Hope this will weigh you in on your 2 cities decision.
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