In reply to boots:
> Preferably out side of Narvik in the mountains/fjords
In case you didn't know... Narvik is on a mountain by the fjord.
That said, there are quite a few B&B options, but perhaps not that many online. And you will need a car.
Generally I have stayed in a tent on the beach close to the old bridge ( a tad inland from Narvik). Which is just fine in good weather. And then searched for indoor accommodation if the weather turns nasty... or bailed to Riksgränsen, Abisko, Tamok, Troms or Lyngen.
A few "big" options are http://www.katterjokk.se/ (in Riksgränsen, more akin to a hostel with room kitchen). And https://lapphaugen.no (close to Spansdal, if the ice is good. Cosy and good cabins).
https://narvikcamping.no/ didn't have all that great reputation some odd 10 years ago... Things might have changed though.
That said, nearly all camping grounds have small huts/cabins with self catering possibilities... Some are spendy and manky, others spendy and good.