I stayed here at the recommendation of my favorite guest house in Chiang Mai. When I arrived, despite me confirming my reservation twice, they didn't have a room for me the first night. I was taken to a place by the high school for the first night instead (friendly staff there - turned out fine, I guess, but still an unexpected inconvenience). Mai pen rai, right?
The staff at Pai Chan was not the warmest, which was surprising, since they were supposedly friends with the owners of two places I've stayed at in Thailand and since Thai people are so friendly, period. I'd say the pool, the view from the pool, and the location were the best parts of my stay. And the obese pug.
The rooms are nice architecturally, but they are SO SMALL with barely any room to even walk around the bed and there is nowhere to put your things, so you pretty much have to pack and unpack your stuff anytime you need something. Then there was the fact that the person in the room next door was actually only about 3 feet away and I could hear her entire 3 hour phone conversation the first night and then every rustle and movement on subsequent nights. The bathrooms, however, are very appealing (spacious outdoor shower area).
There are tons of places to stay in Pai - and a wide range of them. If you are coming to visit, reserve a place for just your first night then walk around to feel out your options. If you are staying a week or a month, you can get very good rates off the normal ones, even in high season, since Pai is really only busy on the weekends (and Reggae festival, which may have been permanently moved to Chiang Mai as of 2011).
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.