sounds good!
double check on that "free" thing...even if the plane is free, there are many more costs associated with flying in Europe than here...but maybe you are very farmiliar - your post didnt say.
For info, check with a handler if you have access (Universal, Jepp, etc..)they can give you ideas. Maybe check the Jepp index for Europe and look under Germany, will give you ATC, Entry Requirements, etc...
Is this Cessna and Piper type flying? VFR? maybe a good bet would be to hire an instructor over there...just to get the feel for it.
My experience with Germany (Frankfurt, Dusseldorf, Berlin, Munich) was all good, good english, semi-flexible slot times, etc....but I dont pay the bills so I couldnt help with ATC, handeling, fuel costs, etc....
Have fun!