I would give six stars if possible, because it is simply one of the best and most unique hotels I have ever stayed in. First, the hotel is situated within an art museum and quirky sculpture park on a hill overlooking the sea. The stay includes access to the museum and park grounds, which makes for a very nice walk. A special aspect of the rooms themselves is that they are decorated much like an art museum too, such as with a wooden bowl-shaped bed and an old-fashioned radio. The rooms are very spacious and comfortable.
The best part of the hotel, however, is the staff, who speak English and are very attentive. My girlfriend and I arrived too late to have dinner at the hotel, and the staff had trouble getting a taxi to drive out to the hotel to take us to a restaurant. So one of the employees voluntarily drove us in his own car to a nice restaurant nearby, and talked to one of the restaurant waitresses in Korean to take us back to the hotel after dinner. The combination of the service, locale, and museum theme made it a truly unforgettable experience.