agree with can-do-man i too wouldnt be overly concerned about it lots of people dont even know what temp their fridge is like he said as long as it dosnt freeze and not kept in direct sunlight and heat you should be fine. Make a quick call that should put your mind at rest and enjoy your holiday in Germany
You might want to put a call in, myself I wouldn't be to concerned over this as were only talking about what 4 degrees? Now if you was storing it for several months then maybe. The main thing is don't let it freeze or let it be in direct heat... Then it would become a problem.
Enjoy your vacation, wishing you the best.