Check out Historic Charleston Bed and Breakfast, my family has a rental at 12 Water st. right near the harbor-walk to the wildlife expo,restaraunts and bars etc. It is very reasonable for the location-ground floor of a historic home built in 1750. You can email or call me 8438300448 if you need a contact number but Historic Charleston BandB does the reservations-my email is
captain@saltcharters.com