If you do go to Longyearbyen please look at excursions to Pyramiden. It is a1&1/2 hr boat trip north to an abandoned Soviet mining settlement. It is a virtual ghost town as though people fled and left all behind. Schools, musical instruments, apartments, equipped kitchens. More than I can describe fully here. Utterly amazing! It is a beautifully preserved “community” and the residents loved their lives there.
I don’t know how to upload photos but I have so many. We went in July and it was freezing!!