My daughter's first pet was a rabbit. He was a great little guy. His cage was never smelly but he was a dwarf bunny so I don't know if that was the difference. I had read that females are very easy to litter train and males very hard. I asked for a female- (darned if I could tell the difference) but it turned out to be a male. I freaked when his testicals dropped thinking my "girl" had a tumor.
Um, yeah, that was embarrassing! Anyway he wasn't so good with the litter box but his poo was very hard and had no odor so I just had to be ready to vaccuum whenever he had been out. Females are no problem from what I've heard. He was a really sweet little cuddle bug.
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"If you have men who will exclude any of God’s creatures from the shelter of compassion and pity, you will have men who will deal likewise with their fellow men." — St. Francis of Assisi, 1181-1226