I can also say +1 for Achima's post.
Good thing no A or B airspace to worry about.
Smaller airfields will not have cash machines, and some of the larger ones may also not have them easily accessible if you are airside.
Avgas is about € 2.60 a Litre at the mo
. So yup a C 172 with long range tanks *ouch*
Enjoy your trip, the south of Germany is a nice place to fly over.
Regards
ITSAB