Years before Willow, my husband bought me a mouse for Christmas--ya know, not a creature was stirring, not even a. . .
He was fairly easy to take care of. We could pet him, he wasn't a biter. Definately, more friendly than a gerbil or hamster, in my experience. But, the urine does really stink. And, they are up all night.
They make lots of cool things for them to play in and eat so they can be pretty fun. But, the cage does need to be cleaned often, ours was daily and it still had a smell.
Mine didn't live very long, he had a seizure problem. I did get him vet care but even with the medications he didn't make it.