Hi 933stanis, when we stayed at Ecolodge in Oct 2018, the room size was approx. 140-160 sq ft. Comfortable for 2 Adults but I think 3 Adults would be the maximum. There are no beds just Futon (Jap mattresses) on the floor - which the guests have to lay the futons themselves in the night. Equipped with common toilets both upstairs & downstairs but main bathroom with a soaking pool aka Onsen is located on the 1st level. I am not sure if there are larger rooms to accommodate 5 people? All 12 of us stayed in twin-sharing rooms. You could forward your query to Ecolodge directly after reserving your rooms on BookingCom The Manager speaks English and is very helpful. Hope the above helps.