While technically we did not stayover in Longyearbyen, we have to book a room as our flight is at 3am and you are not allowed to wait at the airport.
Pros: We loved the "miners" industrial deco of the place, food at the restaurant was good and they have svalbard beers on tap, shared toilet was roomy and clean. Cons: Its a long walk back to town where the attractions were. Having said that, we will book here again if we come back.