When you collect your keys for your apartment, you'll likely need to collect your bed linen as well.
Bed linen will be available to collect from a central location (like the key collection point) or will be available in the room in packs.
It's not very often that beds are made on arrival and the expectation is that you'll need to make this yourself, some of the beds will be folded away so you'd need to arrange the beds first before making them (ie, pull out beds).