"Hotel is very close to Haneda airport. 10 min walk through a shopping center. It had spa (with outdoor pool as well) at the top floor which is one of the best spa in Tokyo. Room is small but adequate especially you only stay for 1-2 nights.
Hotel self check in and check out are so convenient. It takes 5 min for check in and 2 min for check out which is a major plus when you are tight on flight schedule"