I spent three nights in Berlin back in 2018.
It was only a flying visit but I had such a good time. I tend to cram a lot in when on a short trip and one of my favourite things to do in a new city is to take a bus tour if they are available. It’s a great way to see all the major sites.
I nearly got run over by a bus when visiting the area where David Bowie and Iggy Pop used to live back in the 60’s but that’s a different story. Would have been a cool place to cop it though.