I had a very pleasant experience at this hotel and would gladly recommend it for convenient airport access.
I had been staying more centrally in Seoul, but in preparation for an early flight the following morning, spent my final night in Korea at this hotel. Access was a bit more complicated than I had anticipated - despite its proximity to the airport terminal, there is no pedestrian access, and one must take an airport bus to reach it. There is a direct hotel shuttle bus that runs between the terminal and hotel entrance, which I caught in the morning from the hotel, at about 5:00am; it is more like a coach with dedicated luggage storage in the bed of the vehicle. The journey takes only 5-10 minutes. However, this shuttle bus only runs once an hour (and sometimes less, depending on the time of day). As an alternative, a regular airport bus departs from a neighbouring bay at the airport terminal, visiting several stop on a 30-minute circuit; from the airport, this hotel is reached by a 5-minute walk from the penultimate stop (i.e. the stop before returning to the terminal). This is a conventional bus with limited luggage storage.
Transport aside, the hotel experience was excellent, with kind and cordial staff with flawless English, large, comfortable, luxurious rooms, and several food options, including a bar/restaurant, room service, and a 24/7 convenience store.
While I do not think the hotel would make a very convenient base from which to conduct an entire trip to Seoul - the subway journey to central Seoul takes a good hour or more - it is extremely convenient for anyone needing quick airport access, and is extremely pleasant in all other regards on top of that. I had a very pleasant stay and would strongly consider staying again in the future.