The majority of the city’s institutions are closed on Monday. Tuesday and Wednesday are the most suitable days for excursions - many museums and exhibition galleries work till late on these days.
You should speak to local residents using their name or position. If you don’t know such information, then you can use the standard form - «Herr Doctor». The reason for this is in the fact the word "doctor" has many meanings in Germany, so it’s appropriate when referring to people of different professions.
When entering a cafe or a restaurant, make sure you greet the people present with the word «Mahlzeit», which can be literally translated as "bon appetit".
Stores in Berlin are located literally on every street. This is true for both fashion boutiques and small souvenir shops.
The city is very convenient to travel by public transport. The transport chain is really diversified, and there are trolley-buses, trams and buses, trains and underground in Berlin. The subway line covers all important areas of the city. We should also note that certain types of buses and trolley buses run in the city even at night.