Visited Yogyakarta in 2012 with a group of friends. Denny was patient and accomodating to our request. Because we are from the same region of SEA, communcation is not a problem. Denny speaks good English too. He has excellent knowledge on the area, history of Yogya and the religious setting of Prabanam and Borobudor. I enjoyed talking to him on the philosophy of Buddism, meditation, yoga and how it all related to our life. Denny even thought me photography skills. We became friends since. You will definitely enjoy your time in Yogyakarta with Denny as your guide. Highly recommended!