I've been to the Black Forest several times touring on a motorcycle. It's a lovely place, nice towns, villages and countryside. Excellent roads too if you like driving. Bar larger towns like Baden Baden (English football team stayed here during last World Cup) and Triberg etc it's a quiet place (that was my impression anyway). A hire car would be a good idea if you're flying - mobility is essential IMHO. I've stayed in Schonwald which is a very quiet village though kids might bore a tad in a place like this. Generally speaking if I'm touring, I tend to avoid built up areas. You probably already know that this area is famous for its clocks. I find German people to be pleasant and hospitable, but this is generally the case throughout Europe. A week would be plenty of time in this area, in my opinion. Hope this helps.