Get unbiased advice before you buy.
Decoration is definitely low-frills.
It's easy to miss Mae Phim. It's a tiny restaurant, hidden away from the main street. It is worth searching for, as their menu is a wonderful mix of tasty and inexpensive. They carry a wide variety of dishes, but I've only tried a few, because the ones I've ordered have been of such high quality that I find myself re-ordering them. My personal favourites include the green curry chicken, which has a complexly spicy taste and a generous portion size, and the coconut milk and lemongrass soup with chicken.