Korea - Any recos?: Weekly apartment in Kangnam (Seoul, South Korea)

Looking for recommendations for a weekly rental in Kangnam (Seoul, South Korea). Tons of sites listed when searched but can't tell how reputable they are. Wanted to see if any FTers have had good experiences booking through any services.

Oakwood Premier is a combo hotel and apt located btw the Grand InterCon and Coex Intercon, next to airway terminal. Not sure of prices but have stayed for a few nights and has full kitchen, w/d, etc.