@Kacy1 Awful. I'd venture a guess that this supposed "host" isn't even the owner of the place and doesn't have permission to sublet, he just thought it was an easy way to make money while he went to sleep on a friend's couch.
I'm not sure why you actually stayed there. The thing to do would have been when you walked in and saw the state of affairs, to immediately call Airbnb, get them to cancel the reservation and rehome you. If they can't find a comparable place, you ask for a refund and they will add $10 to soften the higher priceyou may have to pay for a hotel or upgrade.
Tell your friend that reviews are blind- the host can't see what the guest has written, or vice versa, until after the reviews are published. If only one party reviews, that review will be published 14 days after check-out. It's important that your friend understand that she needs to leave a review to warn other guests. Thumbs down, 1 star all across the board, and flag this host's account. Also phone Airbnb to tell them that the photos are of another place, and all the rest of it. This host should be delisted.
The worst he can do is respond to your friend's review (but only if he has also submitted a review) and if he does, it will probably be nasty and full of lies. What your friend needs to know is that it's usually easy to see who is the guilty party in these scenarios. If your friend states what you guys found, and how it was misrepresented, in a non-emotional way, just the facts, she will come across looking reasonable and truthful. Maybe you can write it with her for emotional support. I don't think she has anything to worry about, but that host sure does.