Roughly in order of time spent, Neumünster, Bochum, Frankfurt am Main / Mainz, Hamburg and Berlin. I've never lived there, but my GF is German, and have been to and fro for weddings, meet parents, various trips etc.
I should hasten to add that this isn't an exhaustive list, I've been on a number of train trips too, but I wouldn't count the handful of hours in those places, e.g. Lübeck, Kiel, Flensburg.
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Roughly in order of time spent, Neumünster, Bochum, Frankfurt am Main / Mainz, Hamburg and Berlin. I've never lived there, but my GF is German, and have been to and fro for weddings, meet parents, various trips etc.
I should hasten to add that this isn't an exhaustive list, I've been on a number of train trips too, but I wouldn't count the handful of hours in those places, e.g. Lübeck, Kiel, Flensburg.