@Julie3684 One of the things I love about having participated in this forum for a couple of years is that I now know exactly who I would book with if I went to Croatia, Australia, Berlin, London, almost everywhere. I wouldn't even need to spend time perusing listings for the area.
Back to your review question. This is a really tough one, as it seems the guest who booked was actually fine, it was his buddy who was the problem. I hate it that we can't skip over the ratings and just leave a written review. I'm stumped. While I always urge hosts to leave an honest review, if it were me, I might just decline to leave a review, unless you get a notice that the guest has left a review. It seems wrong to punish the guest for his buddy's damage, especially since he didn't just blow you off- he said his friend did it and passed the communication to him.
So if you do leave a review, as far as the stars go, I'd mark them as if the buddy were not part of the equation, but in the written review, mention that while the booking guest was fine, one of the guests in his party caused some expensive damage, and it wasn't okay not to mention it before they left.