This hotel is pretty decent. The beds aren't the most comfortable but they're functional. The fridge in our room was kind of loud and it's the type of room where there are A LOT of status lights (on electronics and such), so if that bothers you beware! We also had some issues checking in because the door staff didn't speak English and thought I wanted to book a room - after showing him the email confirmation he spent a bunch of time on the phone being talked through checking us in. Checking out was a breeze, though, since you can just leave the key card in the elevator....
If you're wondering, this is kind of a love motel. They give you a bathroom pack with some interesting additions, the beds/floor are heated, and the door to the bathroom doesn't give that much privacy. We didn't use the shower/bathtub, so I can't comment much on that.
But realistically, it doesn't matter if you're just looking for a place to stay that's close to the airport (only 20 mins by rail/walking for 1300₩ or so).