Hi @Macy44
It's unusual in most regions for an Airbnb to be booked without linen - one would generally expect linen and towels to be provided. This may, however, not be practical in all situations and there certainly are exceptions. If guests are required to bring their own linen, the host usually needs to make it very clear to avoid a misunderstanding.
I don't know whether you're asking about a past, current or future booking, but if it's a place you have not yet booked and you worry about whether linen will be provided, it's best to message the host to ask before booking.