@Jennifer2682 Since they didn’t break any house rules, I would give them the same number of stars you were going to give if they had not lit fireworks. I would just add something like, “Oh my goodness, guests shot fireworks, but my fault for not having “no fireworks in the house rules.” Hosts can read between the lines.
I say this because I have almost 5 acres of woods and I also had airbnb guests the 4th of July. It never dawned on me about fireworks. But it will definitely be in my house rules for all the upcoming 4th of Julys.