If I had to use a Laundromat I would leave my clothes to. When I was in uni dorms we had these very nice, brand new flats. Our building had 3 floors, so 3 flats to it (with gigantic ensuite bedrooms - it was very nice!) and ours had a little laundry room on the ground floor. Its had two washing machines and two dryers lol. Some people use to sit in there but I just dumped my stuff and came back roughly when it should be finished. Only one time did someone touch my stuff and all they did was remove my washed clothes from the machine and dump them in the dryer so they could use it. I didn't really mind. You could be waiting hours sometimes for someone to come back and get their stuff.
Its was my mini, Cornwall version of your NY Laundromats!