We're finally getting a handle on our summer trip to Germany and I had a question for anyone who knows the area well.

Specifically, what is the best sity or town in the Black Forest to use as a 'base'. Somewhere we can return a rental car (doing a 1-way rental to drive around southern Germany, ending up in the Black Forest) that has good rail connections back to Dusseldorf (to catch our flight home). From looking at map, Freiburg appears to be a good candidate for everything, even side trips to Switzerland or France if we so choose.

Are there better spots? Baden-Baden seemed skewed to the north, just as Lorrach seemed skewed to the south.

Thanks in advance!