When the subject of a good city for home basing and doing lots of day trips by train comes up, the usual suspects of Munich Berlin and Frankfurt are brought up, understandably so as they are transportation centers with direct trains going all over the place. I'm intrigued about the idea of Mannheim however. I stumbled onto the idea while researching train times from Heidelberg to different places. So many trips from out of Heidelberg included a stop or a change in Mannheim that I started to research Mannheim itself.
Due to its location to the south of Frankfurt but not too far south, and its location apparently on a lot of IC train routes, there are alot of quick train trips to all sorts of places. By quick I mean under 2 hours each way which is my personal crossover point for whether a destination is good for a day trip.
Outside of obvious easy day trips of Heidelberg, Worms, Frankfurt, Darmstadt, Mainz, Wiesbaden, Speyer, Baden Baden, Kaiserlautern, Stuttgart, Karlsruhe, I was intrigued to see that places like Freiburg Saarbrucken and Strasbourg are only 1.5 hours away. Bonn and Wurzburg and Marburg hit up around the two hour limit. Of course Frankfurt is really good for alot of these places as well, but being further south opens up more of Baden Württemberg for easy trips.
I wonder about how well Mannheim would work as a place to rent an apartment for a few weeks, especially the areas near the HBF. Being so close to Heidelberg is nice. I could see us spending some time there.
In this travel scenario which would include a fair amount of daily round trips on IC or ICE trains the Deutsche Bahn flex Twin Pass could actually be a nice purchase especially since we would probably be travelling for close to a month, and the twin pass gets more attractive the more days you want it for. Also, I really liked my IC train trips last year. Trains were fast, comfortable and lent themselves well to roundtrips.