stay in the Harbison area or close to downtown. The great thing about Harbison is there are a ton of restaurants and shops, including the mall. Downtown works great as well, depending on where your clients are traveling from. There are also a few very nice hotels over in NE Cola but again depends on traveling distance for your appts, NE Cola is about 15 mins from the Harbison area.
I've also advertised on here as well as P411 and DateCheck. DateCheck seems to work very well for me and so does TER. Just a few suggestions, hope it helps.
Have a wonderful time in Columbia, the men there are wonderful!!!