Well, having my opinion of carpet that I have had for 30 plus years, you would think I would be the last person in the world to buy a Casita! But I did just that, 5 years ago. My biggest concern was cleanliness. Honestly haven't found the carpet on Casita's wall's, ceiling an issue at all......... The floor, that's a different story! But I took care of that.......
I too, was worried about odors, I don't cook inside so the odor issues has been avoided. But would have to say, that you would have to cook some pretty greasy, stinky stuff for the odor to linger long. At least that is my Casita
As far as condensation, living in CO I haven't found it to be an issue. So will let others in more wet weather area's comment on that. But will say, Casita's come from Texas. And Texas is humid sticky area, if the carpet was a huge issue than I think those Texans would change it up.
The one nice thing about the Casita
wall covering, it's cleanable! I have taken the carpet cleaner and cleaned my interior. I vacuum a few times a season, but not because I have to....... Just makes me feel better!