How does the safety record of a Cessna 152 compare to a jetliner in Europe?
I can't give an answer on this, but the reasons why are informative. General aviation as a whole has a higher accident rate than commercial aviation, at least in part because of the many varied missions, some of which are inherently higher risk, like:


Microlights
Homebuilts
Cropdusting


So the statistics aren't going to be very much to go on. Additionally as you mention it varies a lot globally, and there's variations for the type of flying, time of day and other factors. Focusing down on the C152 isn't going to give you a good figure because they are an extremely popular training airplane, which is a higher risk activity. 

Basically you want to know what the accident rate is for a European Cessna 152 flown in the day by an instructor pilot for non-training purposes, there just isn't any data source for that. It's going to be pretty low I would imagine.