Another option: There are several nice B and B's in the downtown area...we stayed at the Vendue Inn which let you borrow bicycles to tour the DT historic areas and farmer's mkt. You are walking distance to several areas of interest and good restaurants...don't forget to try the "she crab soup"!
P.S. We will be staying at the Charleston Marriott on May 7 and 8 with other members of our Corvette Club (as part of our Carolina cruise). Look us up if you are there then!!
Oops, just noticed the date on the original post...my bad!!