Yes, but give serious consideration to honest mistakes. Did they have a max occupancy you overlooked or an additional charge on their rates for over 4 persons that you didn't read? They refunded you so it doesn't sound like it was their intention to overcharge you.
My VRBO website for both my properties are very explicit about maximum guests, yet I get inquires constantly for more persons than what we have as the maximum. I try to be careful ton make sure the inquiry had no more than the maximum but in many cases they don't list the # or are honest about it. I have learned to have them confirm it explicitly but it's hard to remember when getting so many inquires everyday. I can see how an owner would not notice and rely on the stated max occupancy in their listing.
I also suggest you look at the # of bedrooms and bed size to determine if it makes sense. I know some owners would rent their properties regardless but I don't allow more than 2 per bedrooin in consideration of my neighbors.
Sadly, about 70% of my inquiries don't read the info on my website including the location, amenities, availability or rates. It's pretty frustrating.

VRBO will not post a review from a guest unless the guest actually arrived at the property. They don't have to stay there, just arrive.

Vrbo reviews your review. As long as it is true & no fowl language or aggressive content. They should post it. The owner can respond to your review & probably will with their excuse for why its your fault. Just be fair & honest. Your review helps protect other renters.