O.k. that is more of a gift rather than a steal.
Not a thing wrong with it other than mouse smell.
I had to deal with that once in my wife's Ford Contour. Without going into the gory details, eventually I took the whole interior out. I pulled the nasty sound insulation from under the carpet and replaced it with carpet padding. I deep cleaned the carpet with Bissell Carpet and Upholstery Cleaner. Rather than using the Bissell machine I used the garden hose and a floor scrub brush to rub the cleaner stuff into the carpet. I did it at least 3 times. Then I used the machine to vacuum off most of the water and I dried the carpet hanging over a fence in the back yard.
I used the Bissell machine on the seats. And I sprayed Febreeze on the headliner.
The good thing about the Vibe's interior: it is really easy to pull out. I cleaned the Vibe's carpet as well.
Of course it all depends where you find the animal's carcass. In another car I found a dead mouse in the blower.
Have fun!