Rovaniemi is right at the Arctic circle in Finland, the capital of Lapland, and one of the world's top spots for watching the Northern Lights. A great place to just chill and absorb the beauty and serenity of Lapland is Muurola on the outskirts of Rovaniemi. Look for cottage accommodation by Ilkka on Airbnb - we booked for one night, and ended up staying for 3 nights in this pretty cottage by the river Kemisjarvi.
And yes, we did see the Northern Lights. We weren't lucky enough to see the spectacular displays that we've all seen on Discovery Channel, but saw just enough to make sure that we make a few more trips up north in the quest for those displays.