The room felt a bit dated (had a musky odor to it, like old house smell). I would suggest replacing the carpet with laminate or tile floor in the next renovation to deal with that.
The staff, gym, laundry, and other amenities are exceptional quality —comparable to a 5 star hotel (which we also stayed at in Seoul), but in a smaller space.
The location is optimal if trying to explore many areas. Basically on top of a subway station with direct lines to most attractions. 10 min walk to the famous shopping street, < 30 min walk or subway to basically anything else you’d want to see as a visitor in Seoul.