If you haven't got any electrical switches on the panel the procedur is following
-Remove trim piece around door lock mechanism.
-Then pry off the trim piece around the door handles upper end. You will find a bolt under that holding the door handle to the door itself. Remove it.
-Now you can gently push the whole door panel straight upwards and it will come off.
This should be it. It is very easy to do and shouldn't even take a lot of time
Of course...this was done on a '87 but I can't believe they really changed the interior that much....
'87 MBenz 190E 2,3 8vlv