Hurtigruten, goes from Bergen to Kirkenes, used to be very important part of communications in the North of Norway, now the ships are much bigger, but mostly optimised towards tourists.
While I wrote that Tromsø is not so cold in the winter time, one doesn't have to go far to find very low temperatures. We're living in Oslo now, ten degrees further south. Winters are comparable, but much shorter, and summers are warmer and longer.
Yes, Hurtigruten, that's the one. And yes, I think Tromso is suppose to be one of the warmest place you can see the northern lights, because the warm Atlantic current is keeping it warmer than most cities of the same latitude. But as soon as you go inland you start to get cold real quickly.
Quite correct.
I'd say that Trondheim/Trodhjem is the northernmost city in Norway, anything further north is a town or village.
The very best places to watch a polar light - it's in the mountains and hills. I'dlights is toat the polar claim the third best place to look