Sorry, I thought your uncle was still stationed in the army. Apologies for that! In that case, it makes more sense to take a day trip to Rothenburg.
It takes around 7 hours by train from Berlin to Rothenburg. Rothenburg lies on the Steinach-Rothenburg rail line, with frequent connections to all major German cities, including Nürnberg and Stuttgart.
Hotel
accommodation in Berlin I can suggest, is the Hotel Pension Columbus near the Ku'damm. Rates start at $70 but check before you book through them.
A good and affordable place to
dine in Berlin is:
Garage which is located near Kurfürstendamm and has friendly service. Main courses are between 8 and 13 Euros and have a good selection of wine between 14 and 30 Euro per bottle.
Hope this helps
Vacationbuddy