@Martha870 I'm sure it must be awful to find yourself in a big, strange city, in an unacceptable situation.
Unfortunately it seems you booked through a 3rd party rental placement company, Outpost, rather than booking a place for yourself. Outpost is not your host. As I read their website (I had never heard of them before), they act as a go between to book places for clients, when in fact you could have booked for yourself, there was no need to use a 3rd party placement agency.
So they are not the host at all- they just book places for other people, and obviously do not make sure, nor take responsibility for booking bad places.
I hope they can make this right for you, but it seems like a real mess, because it isn't just you, as a guest, dealing with a host, you have a third party involved. And it is that third party, Outpost, that should be dealing with Airbnb, because as I understand it, they are the ones who booked the place, not you. It's Outpost who should be giving you a refund or solving the issues or providing you with an alternative, acceptable place to stay.