[@Atroposer]

Yeah, I didn't research much into this. However, I was planning on basing them in Eleusis where Demeter and Dionysus were the chief gods back in the old days (at least as far as Google is telling me).

It's "close" to Athens if I'm not mistaken.

Well, I'll have tons to choose from it seems but perhaps the outskirts of Athens would be the best bet so it could serve like the apartment for witches who travel to Greece?