If you wander down a tiny street in the Altstadt (old town), you may come across a nondescript historical marker indicating that “Lenin lived here.”
Indeed, it turns out that Lenin and his wife lived here for a year, 1916-17, while he worked on his book, Imperialism, the Highest Stage of Capitalism. A nearby marker gives more details:
For more, see here and Wikipedia.
David Kotz 
I remember that place and think I took a photo as well. I was intrigued by the store on the ground floor. They sold really neat things and I looked up some of them. Very expensive!
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See also the 1974 play “Travesties” by Tom Stoppard.