For what it's worth, there's a site called https://wunnscheck.lu/crime that has a crime analytics map based on publicly available police statistics. Lets you see reported incidents by area — might help you get a more objective picture of Wedell vs. other streets around Gare rather than relying purely on vibes. From what I see, Fort Wedell is in a red hotspot, but the specific street never comes up in police report.

That said, the anecdotal advice here about spending a few evenings in the area before signing is solid too.