Op, I think you should bring all this up. If it were me, I'd ask you to please just leave the dishes in the sink. I can't always get to them in the mornings, because I get up at 5:30, have a conference call 6-7, and have to dash out the door at 7:30. i feel terribly guilty that I sometimes leave dishes and an unswept kitchen floor in the morning, but I am not superhuman.
Lateness is irresponsible on their part, though. I would put a stop to that by saying that you will be arriving late the next morning by however minutes they were late, because you need to finish your own commitments.
-MB