We booked a month ahead and I got an entire one bedroom suite with large kitchen for a very reasonable cost. I stayed there for the Cosmobeauty show. A little confusing to figure out how to access the mall from inside but once I realized I just had to step outside and walk to the left, the mall and conference entrance was right there. The room service was expensive but so delicious after a long day of travel. We were able to make it last for another meal. The restaurants in Coex are also very excellent. You cannot find a bad meal in Korea! Concierge was pretty helpful. I recommend asking them for a private car if you have more than two pieces of luggage.
Aparcamiento (gratis)