Best thing to do when arriving in Heidelberg is to pop in to the Tourist Info office next to the Hauptbahnhof (train station)where they are very friendly and helpful. There you can get maps and info on the city.
Wherever you travel in the world today, you will not be far from a cyber port. The Internet Cafes Guide offer world maps to help you locate the Internet Cafe nearest you. Yahoo.com also offers a comprehensive listing.
This is also a good cybercafe guide. Take a look?
Photo Below: Yes, me again... inside the HEIDELBERG CASTLE. :-D