I chose this hotel due to its proximity to the offices that I need to visit (as I was on a business trip). The location is just across the Gimpo Airport which you can access either by crossing the street or via the underpass connecting the mall and the airport. The hotel has access to the mall with a wide selection of retail stores and restaurants. Everything you need is available inside the mall including groceries for snacks and toiletries, and money changers.
The room that I got has a direct view of Gimpo's runway and I can actually see the aircrafts landing and taking off. One thing I liked with the rooms is that I was not disturbed by the airplanes' loud roars. Excellent soundproofing of the rooms. The size of the room is adequate and sleep quality is great. Since this is a new hotel, I cannot see any faults on the bathrooms.
Service is good and the reception staff can speak and understand English and readily offers help in directions and transportation options. There is free shuttle that goes around Gimpo (international terminal - domestic- cargo - offices) but does not pass in front of the hotel. You need to cross to the airport to catch this shuttle.
The only downside of this hotel is when business is done and you need to go to the city (Seoul) to see the sights. You need to take the subway/train and it takes around 45 minutes to reach downtown Seoul by taking the normal train. The airport express is much faster but also more expensive.
If you want don't have any business in Gimpo and you are primarily a tourist, don't choose this hotel. There are other good hotels downtown but if you don't mind the travel time then go ahead and book this hotel.