Our stay was nice as always..we have been staying and preferring Mystays Premier Narita for years, the hotel has the amenities we need the rooms are spacious and comfortable, the staff were always nice, love the family mart inside the hotel. On this stay we had to call since the ac was nit cold, the staff came up to check and switched us to another room, they were helpful but the second room the ac was still not cold. We didn't do anything else and understood that the temperature outside was so hot it probably was too much for the ac to keep up, or the ac system was just too old for big rooms and need maintenance/update.
One other thing is the spa/hot bath hours was not convenient, 1500-2200 if it open till midnight and as well for a few hours in the morning, we would love to use the spa but by the time we got back from our outings it was to late