If she gets two females they don't mark as much as the males [so less smell] but if she keeps up on cage cleaning there is no odor. I got two males who are going to be neutered soon [I work in a vet clinic so it's cheap.] They are very smart. You can litter box train them, mostly for the poops but I think some people have been successful with fully litter box training them. You can teach them all kinds of tricks, they are really smart and a lot like dogs.
They are pretty low maintanence and easy to care for, they can eat pretty much anything... I've never been a small animal person but I can say they are a lot of fun.