This was such an amazing experience.
Yochi, the monk who did our check-in was so welcoming and friendly. He explained to us the best sites to visit, which buses to catch, where to buy food etc etc. We were made to feel at home as soon as we arrived.
I recommend doing the morning sutra ceremony at 6.20am, it's such a nice way to start the day. The head monk spoke to us afterwards giving us wise advice.
Our room was very large, clean and confortable. With a little table, sitting mats, tv and kerosene heater.
If you are visiting in the winter it goes without saying, bring warm clothes, it can get very cold in Koya-San.