Last update to this blog was in July. I am getting lax, I think.
We recently travelled to Germany (Frankfurt, Stuttgardt, Munich, Berlin and the Rhine region)
Cleanest city: Munich
Coolest city: Berlin
The eurail pass is definitely the way to go. Excellent network of trains with an up-to-the-second web site allowed us to plan our days from the comfort of our hotel room.
If you are planning on taking the citynightline train from Munich to Berlin, think small. The sleepers are tiny.