In Northern Europe there are many places where it’s possible to see auroras. Northern Finland, all of Iceland, Northern Norway and Northern Sweden are all great places within or at the edge of the auroral oval. Choosing between these is a matter of preference, I’ll leave that to you.
A good decision maker for a travel destination are the Kp-lines of the  Kp-index maps from NOAA (Eurasia and North America). Being somewhere near the Kp=3 line will give you a good chance to see auroras near the horizon towards North-West and a fair chance to see them dancing above you. If you go a few hundred kilometers North your chances drastically increase to see auroras dancing all around you, because you are entering the Kp=2…1 zone.
Remember, strong geomagnetic activity (high Kp-value) occurs less frequent than weaker activity.