They are on airbnb, but don't have the listing really correct. It's a 6000 square foot villa on top of a hill (with the stairs to match). The $100 a night price is for 1 out of the 4 rooms. I think they will be moving to rent the whole villa out, instead of having single rooms (including free use of everything else) before too long. It's also for sale for 1.5 million.
The owner will be changing the airbnb pricing to $250 per day. If you want relaxing in Ubud, at a great price, I'd jump on it quick. It has parking at the bottom of the hill. You can even see the new Westin Ubud under construction a KM or so off in the distance.
https://www.airbnb.com/rooms/6786168
If you need any other info, just PM me. I have no financial interest, but was so impressed with this place. They also have some kids bunk beds, so could easily accomodate 12 people for the entire villa.