Heidelberg is a nice old town featuring a renowned University and "the world's most famous castle ruin". The town itself and it's surroundings offer many interesting cultural sites sites as well as places of great natural Beauty.
My apartment is located in the south of Heidelberg, in the former old village of Rohrbach. There are restaurants, shops and all the usual facilities at foot distance + a shopping center at a 2km distance. Good public transport within Heidelberg and Rhein-Neckar Region.