I stayed at Rung Arun a few months ago and loved it. It was one of those places that I say to myself "I'll take the time to give them a great review when I get home", and then I get lazy and never do. But this time I am because they really helped me out.
After months of travel I realized I left a memory card with many weeks of pics somewhere. I emailed Rung Arun and they got back to me saying they had found a card. They have now mailed it back to Canada, and have not charged me a penny, even though I've tried to pay for their troubles and mailing costs.
The other reviews will tell you why to stay here (great beach, amazing people, good food), so I'll leave mine at that.. they are genuinely great people that will go the extra mile, even after you've stayed there.