Spent 1 week ar Papa Gayo as a base for the climbing peaks in the valley of the volcanoes (booked though Gulliver tours). Great base for walking or climbing since it is at elevation 3000m and the Illinizas, Cotopaxi, Ruminhui and other peaks are all within 1 hours drive. Staff super friendly and helpfull. They have four dogs that will follow you as you walk around the hosteria as well as a cow for fresh milk LLamas and other animals.
Hot water a little variable however I cant think of other places where you can acclimatise in comfort