My best guess
Pros:
Geographical location may favor certain satellite orbits.
No population centers in the launch direction, just sea.
Nearby military grade airport and harbour.
Mountains shield most of the direction where people live (Andenes with 2000 people is the only nearby).
Rather cool summers
Norway is a stable country, as well as a Nato member.
Cons:
Other satellite orbits not as favorable
Weather exposed, heavy snow showers in winter
Often strong wind
Mountains may generate turbulence at some wind directions
Salt spray during storms
Freezing temperatures during part of the year
Rather cumbersome to reach by road.
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