I stayed in one of the themed room. The room is full of cute decorations, as well as two extremely large plushie of the character. There are also a few gifts in the room as well.
The room is clean and the hotel environment seems quite new as well. This being an airport hotel, the transportation is very convenient as well.
There is a hot spring in the top floor. This is a bit different from a typical hot spring hotel, though. You need a ticket (either included with your plan or bought separately), and then you are given a IC tag and key. If you want to buy from vending machine inside, you would use the tag instead of your IC card for transportation. When you leave, you would pay at the exit counter, so remember to bring some cash with you.
There is only one problem with the room, though. It sense if there are anyone in the room. If you are staying alone and went to the washroom for a long time, the electricity would cut off.