Wonderful and relatively newer hotel attached to Terminal 3. You will need to clear Immigration to access, but once there, we were surrounded by a sense of calm, a quiet respite; much needed after a long flight.
Chose this hotel due to its proximity to the airport, transportation, and onsen. All were stellar. The staff were gracious hosts; incredibly kind at check in and helped us figure out some train directions. NB: It is somewhat of a ways from the center, which is a particular consideration when the trains stop running as taxis will be the only way back and quite pricey. For US folks, think Uber Black + surge pricing. Even that in mind, absolutely worth it, imo.
Room was very clean, spacious enough with a lovely shower with full amenities.
Breakfast was both a menu and a la carte offerings with ultimate Japanese hospitality from the gentleman who stored our luggage and attendants who were again, very kind and helpful.
Onsen is 24 hours save for cleaning, which was quite relaxing and busier than I thought in the later hours.
Would absolutely stay again.