Quick facts about Berlin

Currency: Euro (EUR)
Language: German
Population: ≈ 3.7 million (Berlin City); ≈ 6 million (Berlin Metropolitan Area)
Climate: Oceanic, with mild winters and warm summers
Time Zone: Central European Time (CET), UTC+1
Visa: Germany is part of the Schengen Area. Most EU/EEA/Swiss citizens can enter visa-free, as can visitors from the U.S., Canada, Australia, and several other countries for up to 90 days.