Paul-Lincke-Ufer was my first flat in Berlin, in 2008. A bedroom then went for €400/mo, and that was considered high then. Now I imagine it is 3-4x that.
I had a tiny studio with coal heating on Maybachufer in 1996 for under 200 DM (!) per month, "warm" (i.e. with the coal it was about 200).
But even back then: a single company owned the building, and kicked everyone out so they could renovate and get their gentrification bonus. To help motivate the older residents they started the exceptionally noisy renovation work at 6am every day.