Futon bedding on the Tatami floor (Japanese traditional way, but with an extra mattress :).
Room size - 5.4 m x 4.6 m (18 ft x 15 ft).
With terrace - 3.7 m x 4.6 m (12 ft x 15 ft).
Your own private bathroom down the hallway (separate key will be provided).
If you don't mind crowding, 5 people may be possible.
A 2 night minimum stay may be required for some seasons.