I booked the Suite at Grand Mercure Imperial Palace during my stay in Gangnam, and it was amazing. From the interior decoration to the our hotel room, everything was immaculate. All the staff were very friendly and professional, offering help whenever they can. I would recommend this hotel to anyone visiting Gangnam, as the location was perfect. It was minutes way from subways and bus stops, which made it incredibly easy to travel around. If I'm ever back in Korea in Gangnam, I plan to stay at this place again!