The first thing you need to know about Berlin is that it is more of an island surrounded by Germany than a part of Germany itself. Berlin sort of makes its own rules. Because Berlin is an international metropolis, it not only attracts foreigners, but also Germans from all over the nation. Therefore, the concept of German traditions and lifestyle remains.
Germans also expect to hire you to do a good job. They will very rarely tell you when you do a good job but rather let you know when you’re not performing well. As such, you will most likely have to go claim your raise or bonus.
Do not interrupt anyone when they are talking. It’s fine in France and Italy, but it is a big insult in Germany.
It will also be appreciated if you say "lass(t) es dir (euch) schmecken," meaning "enjoy your meal." If someone says it before, you can simply reply "eben so."
In general, if you do not know a person, start addressing them with “Sie,” which is the polite form of you or “Du.” If a person is young, it is usually accepted to refer to him as “Du.”
So far, I have met many Berliners and Germans from all walks of life from artists to DJs, from entrepreneurs to comedians, all of whom abide by the recycling guidelines. The glass goes in the container of its rightful color, biodegradables are gathered together, as is paper and cardboard. Plastic and packaging are gathered together, and finally there is a separate entity for all trash that cannot be categorized in the above containers. In Berlin you will see a lot of bottles and cans gather under a public bin. This is OK, because these bottles have a "pfand" waiting for them at every supermarket. Bring your own bottles yourself to get the recycling money back.