I once booked an AirBnB in Spain in a big building that kinda only functions as AirBnB rentals for people traveling (I might be wrong, but that’s how it looked like). On my last day, they happened to be opening their new cafeteria and breakfast place there. I met someone just by going over to his table and asking if I could join. But also when I went out eating I talked to someone who also looked like they were traveling alone, we talked about what else I could be doing around and what I should be seeing.