+1 for France.
Re Spain: used to be very pleasant, albeit with rather few airfields. Flying in and out of the major airports no problem. BUT, in recent years AEANA have hiked the landing fees to absurd levels and on top have instituted mandatory handling at most airports. This has the effect of vastly reducing the - already scarce - fields available to GA at realistic prices. Sad, as otherwise (scenery) it's a great country to fly in.
One more that is very pleasant and has a surprisingly high number of airfields is Portugal.