We went to Chiang Mai for our honeymoon and enjoyed being out in the rural landscape and next to the amazing waterfall. The staff were very friendly and helpful. There is only one restaurant there with a limited menu, especially for vegetarians. Fresh juices would've been nice instead of the same bottled ones each day. The showers run on solar panels, so hot water was only available at night not in the morning, this was ok with us but did upset other guests. There is not much to do but relax. Trouble was there's not many areas to just relax except your room or spikey grass, some hammocks or chairs on the grass would be good as not many places to sit and enjoy the view. The tours were good, but a bit expensive for what they were. Also, when we arrived a HUGE lunch was cooked for us which we did not ask for (most of it was meat and I am a vegetarian), we were charged (a fair bit) for this meal, even though we didn't really want it and I couldn't eat most of it! This was a bit rude...
When we went to pay at the end they added on a 10% service fee and 7% tax so it bumped up the price by $200, they should let you know about this prior to requesting it as it was a bit of a shock.
I guess it depends what your after, if you don't mind being very remote and spending a fair bit of cash then it may be perfect for you.
Staff are great, but a few improvements need to be made to make it more relaxing/enjoyable and less pricey.