I'm always very thrilled when I can do laundry while on vacation. Because laundry on vacation is infinitely easier then laundry at home! I live in an apartment building and I am not allowed to have my own washer & dryer, instead I must lug all my laundry down the hall, down the elevator, down another hall, hope a machine is empty, pay, remember to be back down promptly to move it t a dryer (again hoping a machine is available) then remember to get down promptly, to haul it down a hall, up the elevator and back down a hall, and I must do this all within the laundry room hours, which are not 24/7. Oh and I need to work around my work schedule because when I'm home I'm not on vacation. If at someone's home or a vacation rental with a washer & dryer 1 or 2 rooms away and a nice relaxed schedule, laundry is 100x less of a chore. And it means when I get home, and resume my work schedule I don't have a huge pile of dirty laundry waiting to be done.
Also, I generally only travel with one suitcase. So if I'm not doing laundry, I have to pack any dirty clothes in with clean clothes, which I don't care for at all. (Yes I usually bring a large plastic bag or something for the dirty clothes, but folded clothes fit in suitcases better, and i dislike folding my dirty clothes.)