The Raydan .. listed by DR1, is probably the best.. it is near the center of town, and has a good restuarnt. Clean rooms, good staff, air conditioned...
Does not have internet but there are a couple of good internet cafes in Dajabon.
Enjoy!
If you are going by private car, be sure to go to Manzanillo, (pepe salcido) where you can swim across the mouth of the Massacre River..