Just stayed here for a night to do the Batur sunrise hike. Don't think I could've taken much more, but it is cheap and the view is spectacular. The bathroom had a very musty smell and was hard to bare, but maybe that's just me...Don't eat at the restaurant, they only had a select handful of things available and it was so bad, I couldn't even finish.
As far as hiking Batur, which is the only reason to stay here, it's a cheap place, with a friendly staff that can help set it up. They also have their own van for pickup/dropoff in another area.
On a side note, there is only wireless in the office/restaurant and maybe the closer rooms.