When my roommate at the time got noro in December, I was freaked out like you are, because we lived in a tiny apartment with one small bathroom! I was terrified. But, I didn't really have other options so I wore moccasins and used my foot to flush, used a paper towel to turn the faucet on/off, use soap dispenser, turn light on/off, open the door, etc. Also I made sure to scrub my hands really good with nice hot water and always used paper towels instead of the shared hand towel to dry them off. I didn't end up getting it. So, those are options if you want to be extra-cautious (if it was noro, she's still carrying it in her #2), but as long as bleach has been used to clean the surfaces and no one's been sick in there since, I'd say you should be fine.