The formal forms of address are appreciated until you get to know others better. As everywhere else good manners go far. This is especially true of older folks. "Kennen wir 'Dutzen'?" is what you will hear, meaning "we're friends now, let's switch to informal "you." It's always a lovely moment.
If you travel on public transit it's good manners to give up your seat to an elderly person or pregnant woman. Especially the seats nearest the driver or the door. It's downright expected. When I was a young adult college student for a summer in Vienna, the older people were known to call out youngsters for not giving up their seats! LOL.
And they are right, the Germans and the Austrians appreciate anybody trying to speak and learn German. They encourage you, no matter how badly you think you're doing! 
An evening in a restaurant with locals can easily turn into an impromptu language lesson! 
Restaurants: If you order water, you will get mineral water. And you will have to order ice. Ice is an American thing, not a European thing. If you go to a bar and don't feel like drinking, you can order "gespritzt" meaning juice and mineral water combo. For example "apfelsaft gespritzt" will get you apple juice and mineral water. The only place regular water is found is oddly in coffeehouses, especially Vienna: coffee automatically comes with a plain old glass of water. Go figure. But it makes sense, since coffee is a diuretic. I still drink water and coffee to this day.
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