I know nothing of the business itself, but spend a lot of time in laudromats....
LOCATION LOCATION LOCATION... location is essential... you want to be around an area that has a bunchof apartment complexes (that doesn't have laundry on the premises) or at least crappy laundry.
Parking should be plentiful.
Open late hours or early hours-- 9 - 5 doesn't help most people.
A drop off service would be nice to offer...
A clean well lit area for waiting for your laundry, with perhaps a news stand or a coffee kiosk to keeep entertained. Or even, if zoning permits, a bar...
The building I am living in now, uses
Mac Gray equipment, the cool part of this, is the machine is operated by card - rather than having to squirrel away quarters... I can charge my card in the main office and not have to worry... It's kind of a cool feature.