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Amaurobiidae (family)
This is a new spider to north america. It is not dangerous at all to the people in europe and in north america. The one one that I found is female, the male is much bigger.
Hi, just thought I'd mention that while this may be a hobo spider (pictures don't have enough detail to confirm it, though I suspect it might be something else), hobo spiders are no longer considered dangerous by experts. As with many other spider species that are labeled as such, evidence is circumstantial. It's not considered a threat in its native European distribution. There's more on this on the BugGuide info page, along with references to some recent papers on the subject:
http://bugguide.net/node/view/31446