Khmer temples on the Thai-Cambodian border have caused quite a lot of friction in recent times. Nan Rong (นางรอง) is the gateway to the ruins. Honey Inn: นางรอง (Nang Rong). Website: website here.
Single rooms with fans and shared bath go for 150 Baht per night. You can eat home-cooked Thai meals at the inn with the family who live there: 35 Baht for breakfast, 30 Baht for lunch, and 80 Baht for a big dinner.

Nang Rong Hotel: . Website: website here.
A little more expensive, but if that is what you want.

chiang mai guesthouses -- chiang mai meditation retreats and courses -- chiang rai guesthouses -- nong khai introduction (Isaan) -- phanom rung guesthouses (Isaan)