This is NOT a regular silverfish but a longtailed one or paperfish (Papierfischchen when you live in Germany)
Wikipedia: https://en.wikipedia.org/wiki/Ctenolepisma_longicaudatum
They are not as useful as silverfish but not dangerous - except for your books and paperwork. We’ve also have them in our flat. They like it dry and feed on paper.












Exactly. Also silverfish eat house dust mites.