If they'd pronounced it "Let's meet up in the fillage" that would make sense as they'd be using the German pronunciation of "v", but I couldn't wrap my head around "willage".
Depending on the word, in German a "v" is either pronounced like "f" or "w", e.g.
[der] Vogel -> "Fogel"
[die] Vase -> "Wase"
A rule of thumb that I heard is that if a German word is of French origin and starts with V, the V is pronounced like W, otherwise like F.
I guess you mean the German F and W! That way it's clear.
I speak from experience…
Edit to add: she’s German, we laugh about it.
Anecdotally, I once spoke with Russian students (this was long ago) who insisted that there was a Russian 'v/w' sound in the word Berenburg (the name of a distilled spirit). I couldn't hear it...
But in this context, the "v" we're talking about is the English IPA /'v/ (e.g. valley /ˈvæli/) vs. IPA /w/ (e.g. wool, IPA /wʊl/) and that difference is far less noticeable.
For an English speaker, to put it differently, while the words as a whole are not pronounced exactly the same, the starting sound of German "Volk" is the same as for English "folk", while the starting sound of "Wolke" is the same as for "valley".