Here you can find interesting news and a lot of things worth knowing about hiring and letting of living space and especially „temporary accommodation”.
Landlords and owners have to clear their property of snow, if nothing else is bound by contract with the tenants. It's always better to read a hiring contract before one signs a contract, which might contain snow shovelling, so that one doesn't suffer a bad surprise.
The property has to be kept clean from morning until evening, at night there's mostly no obligation.
Landlords can assign other people to do this work, but they are still liable for accidents due to the snow.