Hello, my lease states individual's (non shared) living areas are full responsibility of that one roommate. And common areas are responsibility of all roommates.
if something breaks in someone's non shared area, it is treated like a normal rental. In lease there should be a portion that states the tenant owes up to $xx for maintenance items. At least that is allowed in my state.
if something breaks in shared area, if it is obviously some specific person fault it is treated like the above non shared area. If it is a wear item, or not obviously 1 person's fault, then I fix.
since I house hack, I am there to deal with maintenance item requests. But There are property management tools/ apps to deal with requests.
for laundry, you can get coin / credit card operated machines. Most don't have that, especially when house hacking. Even if you add a few extra dollars to the rent for each person, that should cover it. Just make sure your room rent rate is not excessive compared to other rooms available on the market.