In February 2014 I stayed at the Mountain Green Resort in Dan Sai, a apartment style resort just outside the small town of Dan Sai. The rooms are simple but comfortable with airco, private bathroom and TV. And from your verandah you have a great sunset view over Dan Sai. There is private parking (but not covered). If you like you can even go camping here with your own tent (or rent one). Friendly staff. They have about 15 rooms.
Update : In the years following I did stay there a few times and witnessed a slowly degrading state of maintenance of the rooms. A pity as I like the location and the price.