A couple of thoughts: One washing machine and one drier. Electronic access to the laundry triggers a bill to the apartment owner who accesses it (and a record of who was there).
When you buy or hire the equipment, it may annoy people who have renovated and installed internal laundries who may complain that they are paying for a facility they don’t use but that’s their choice.
Also, coins? Only useful for pool tables and pan-handlers, IMHO.