@Sidath1 I don't see it as "dodgy" if the host set up your rental exactly the way the listing description said it would. One flaw in the way Airbnb displays amenities in the pictograms is that it offers hosts no way to visually distinguish the amenities that are inclusive from the ones that are available by request or at extra cost. But the entire listing text comprises part of your binding contract with the host, and it's always the guest's responsibility to actually read it before booking - even though, to hosts' constant dismay, many guests let their own assumptions mislead them instead of reading.
@Gwen386 In this case, it's clear to me that the request to set up an additional bed is supposed to happen in advance of the stay. This doesn't sound at all like some act of willful deception or false advertising. The host could have contacted the guests to make sure they'd read the listing, and asked if they wanted the second bed (I certainly would've advised that), but at some point people have to take a little responsibility for paying better attention.
Anyway, sorry that your stay isn't going quite as you expected, but fortunately you both have a place to sleep so it's not exactly a travel emergency. I don't think you're due any kind of compensation here (unless that text you quoted wasn't actually in the listing), but if you'd like to move elsewhere you may request a booking alteration to advance your checkout date, and the host might agree to refund the unused nights. In the meantime, here's a clip for you and your friend to enjoy together in bed:
https://www.youtube.com/watch?v=u2pu0m9iTo4&