I think the only Marriott downtown is the Renaissance but it doesn't have self-service laundry. I don't think any of the 4 star hotels downtown have self-service laundry. You may be getting something like a 3.5* bumped up which would be bad. You can get the Millhouse for 99/night straight up on priceline and I loved it. At least then you'd know what you were getting and I think that's important in Charleston because you definitely want to be right downtown or it would suck. Anything downtown on meeting st is nice.