You could try the local flying club, they have Cessna 152/172/182
kontakt(at)bpfv.de
Tel: +49 621 41-3651
There is local heli charter company as well:
Hubschrauber Rundflüge und Flugschule in Stuttgart & Mannheim - Heliseven
Tel: +49 621 / 79 94 46 98