In North America, across hundreds of hotel stays, I have seen exactly zero ensuite washing machines. For extended stays, being able to kick off your laundry and leave for the day is absolutely priceless. Having to set timers and babysit coin-operated laundry on a different floor just isn't worth it, to the point where I'd rather just pay $$$ for hotel laundry service over using their communal laundry room.
A lot of "extended stay" hotels have this. One brand I've used and have had pretty good luck with is Sonder. They're not quite full service -- they have a spartan reception and want you to use their app for everything, but they do have multiple rooms, an adequate kitchen, and washing machines in the rooms.
