Hallo pilot_yak,
I live in the north of munich and I`m sorry, there are no R22 or R44 around here for charter/selfhire (only H269C in Jesenwang and Augsburg ca. 30 km in the west of munich).
There is a private owend R44 in Jesenwang, but I heard it is not for selfhire.
Maybe in the north of bavaria .......
http://www.flugschule-ostbayern.de/
or in Donaueschingen .......
http://www.htc-helicopter.de/1024/html/preise.html
Other locations for R22 are Stuttgart and Salzburg (Austria).
Rates are extremly high, because avgas is €uro 2.15 per liter now
Air Law: everything for what are helicopters made is forbidden :-(
Good luck and a great non-flying-time (enjoy the beer) in bavaria
Herbert