Hi Marine 8,
I was in Krakow last Christmas for two weeks. Went skiing to a town called Zacopane in southern Poland. It is about an hour and a half drive. Lovely place. Lots of snow but was told that January is a better time to go there, much more snow. Great time skiing none the less. Food also was delicious.
Krakow is great around this time lots to do and see. Would recommend a visit
Also by December there will be direct flights from Dublin (Aer Lingus, Sky Europe).
Regards,