I sometimes, rarely, stumble upon these insects, but I have no idea what they’re called. https://s20.postimg.org/oeo7h7qnx/432542.png I zoomed it up a little, he’s about half the size in reality, are they dangerous and is there something that chases them away? Maybe some smell or something…
Btw. I live in eastern Europe if that narrows the search.
Silverfish are harmless, although they might eat your books. According to Wiki, their diet includes book bindings, carpet, clothing, coffee, dandruff, glue, hair, some paints, paper, photos, plaster, and sugar.
My experience with silverfish is from my great-grandparents ancient house. We’d go visiting when I was a kid and when you pulled back the bed-sheets (which hadn’t been changed since we were there last year) there would always be silverfish.