Mice are sweet- I had some when I was a teenager ( but I'm a guinea person really)
I got 2 boys. They absolutely stink . I had then a weekend [shamed face] and had to return them. The (excellant) pet shop owner exchanged them for 2 ladies.
All fine , we got a nice large cage. The blighters escaped (don't know how) up to my bedroom. I was away for the weekend , my mum was looking for them. They found a biscuit and I found them in a pair of dungarees on the floor.
My dad made a 3 storey mousehouse for them. With ladders.
They climbed up the mesh at the front , ignored the ladders.
Then one got a bit chubby.
6 babies.
They are really lovely. They'd be on one of the wheels tottering round. One of the adults got on an wheeeeee the mouselets clung on as it spun round.
We took the babies to the shop, but one escaped and lived in a kitchen cupboard until we caught him.
So. 2 ladies now,
They were lovely, the non mummy one would go in a cardigan pocket curled up.
The mum mouse got a tumour and it got big enough to impact on her life, so we had to have her PTS 
Remaining mouse lived a few months alone but she was one you could carry round.
They do pee and pooh all the while but girls don't smell.
Ours didn't bite (except the escapee when I caught him)
They walked along our arms upside down. Whip you with their tails.
Loved food.
Ran their wheels at 3am.
They are fun, but I like a nice chunky guinea pig boar 