This place is AWESOME. They keep it very clean, the washers and dryers work really well (I know this should be a given, but it's not), and the machines are HUGE (there's also normal size ones, but why use those?). I spend $4.50 to wash and dry a gigantic load of laundry (one overflowing laundry basket worth) in less than one hour. What!
This place is exactly the one you're looking for. But watch out for parking lot potholes, they're wicked.