Different anon here. I’ll do a small exchange program in France next year and I’m planning to spend a weekend in Germany. I like cultural programs, like museums and art/music expositions, so I believe Berlin would be the better choice, but since I won’t have much time, at least on this first visit, could you recommend some “essencial places”?

Any major German city would work for these things as cultural things like art galleries, museums, and music festivals / opera / concertos / rock concerts can be found in any larger city in Germany, but Berlin probably has the greatest concentration in one spot, e.g. Museumsinsel, etc. So it’s a good start if you only have a week in Germany. Have a look at this list of museums and galleries https://en.wikipedia.org/wiki/List_of_museums_and_galleries_in_Berlin
and this https://www.theguardian.com/travel/2011/aug/17/top-10-museums-berlin-city-guides . You might also want to google „insider tips berlin“ for the current best in hotels, restaurants, etc. Have fun in France and in Germany. 🙂 Try the bakeries in both places!