Getting There
It generally takes about 3h15m from Munich on a combination of train + bus. An option is to take the train to Nuremburg first, then another train to Ansbach, then 732 bus for the last 50 minutes.
About
From Touropia: "Rothenburg is a walled town that has remained intact down through the years. It is famous for being the most German town in Germany. During World War II the Nazi leaders habitually took people on day trips to show them this model village. It is also famous for the stores that carry Christmas items all year round and for having an outstanding Christmas market each December."