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Granted I was only in Berlin for two weeks, but all but two people I interacted with didn’t immediately switch to English if they had something to say beyond the transaction. (A bus driver and a currywurst seller, who seemed genuinely annoyed that I was a tourist)
Sounds like Berlin! Bit yes, most people in Berlin will speak english with you, even sometimes when you speak german.
In Berlin in particular they might not even speak German themselves…