@Penny80 Starting out as a naive host, I did include laundry on the facilities available at first.
Most guests didn't use it, however then I had a jogger who wanted to wash his kit in the machine every night for a week, single night guests who tried to do two loads, guest who switched the machine on at midnight, guest who can't read russian and set the machine for a three hour cycle - so as well as hacking me off a tad, often it got in the way of my personal routine with the hanging drier being used when I needed it.
So, I removed it off the listing as being available. I do offer use of the machine for guests who maybe stay over five days or if the weather is a bit bad, plus I add I must supervise the setting and so on to prevent problems and timings. Even then, few people take up the offer, so perhaps it's worth to try it.
With Chinese guests which I have regularly I've noticed they almost always handwash personal items each night in the bathroom and leave them hanging up to dry there, and it's not uncommon to see my bathroom decked out in what looks like underpants semaphore signals, so I now try to take preemptive measures by discussing this during arrival walk through.