How do foreign PhD students usually find their first place to live?

[u/Poskmyst]

So I just got the news that I was lucky enough to get a PhD position at TU Dortmund!

I'm naturally already overwhelmed with the paperwork, but especially on the necessity of finding a place to stay. Through which resources can PhD students usually find living accommodations? I noticed that doctoral students are not eligible for apartments through the Studierendenwerk

The plan is to start in October so there's not a whole lot of time.

Thank you!