We had a great stay at this hotel. It's a brand new facility so everything in the rooms was in great condition, and even the bathroom was very spacious! The beds were very comfortable, and despite having the aircon on all night, the air in the room was not super dry as it is in many (if not most) other hotels. It was also perfectly spotless, another rare occurrence even in the best of hotels.
If one thing could be improved, was the breakfast buffet. It was only 10,000 won per person and children were not charged so it was ok, but the selection of Western food especially could be improved. When we go back, we'll try the coffee shop at lobby level instead of the 6th floor.