Regional characteristics are a strong feature of German life, and there are many hangovers from the days when the country was a patchwork of independent states. To travel from the ancient ports of the north, across the open fields of the German plain, down through the Ruhr valley and on to the forests, mountains and cosmopolitan cities of the south is to experience a variety as great as any European country can offer. Most staff are courteous and helpful, but an unfortunate minority insist on rigid regimentation. Over-27s can't use the hostels in Bavaria at all, unless accompanying children. This is a great site for Youth Hostels throughout Germany.
Text is in both English and German.
The site also lots of info on Berlin. Globetrotter Hostel Places to see This is my favorite European country. I especially like the old East Germany . Be sure to stop at many villages some of them are beautiful. Several of Germany's cities have the air of national capitals.