[Udo]

That depends on what you're looking for, locally. Starbucks is always a pretty good option in Germany, but of course shops have varying levels of noise and connectivity.

The Starbucks in Frankfurt near the old stock exchange is pretty good if you can get a place at the big table it's even office-like, and generally shared by people doing the same thing. The Starbucks in Heidelberg works for me, but it's relatively small. There are also several non-chained coffee shops in these cities where you can feel right at home.

Also, if you're ever in Austria, Vienna is absolutely beautiful for coffee shop work.

The secret to finding these things in Germany is to know they come in clusters. For example, Berlin, Frankfurt and Heidelberg are pretty decent and you can find several nice coffee shops there. Find cities that are somewhat cosmopolitan, because size is a bad predictor for coffee shop density here. In between there are vast stretches of absolutely nothing, but then again distances in Germany are generally ridiculously small even though Germans don't think so.