Male mice tend to smell, not all mice. I've also found that males kept together and raised together do not smell bad at all. IMO, it's when males become sexually mature and are housed with, or in close proximity to females, that's when they will start to scent their enclosures. Also, if you clean their enclosures often, the smell is never that bad anyway.
Kamille, mice can be great pets. I'd suggest, if you are to go that route, to get a same sex pair from the same litter when(or very shortly after) they are weaned from their mothers. They are, by nature, communal animals, so do better in pairs or trios depending on the size of their home. And handle them often. As far as keeping them is the same room as snakes, no problem.