From everything that I have heard first- and third-hand, Las Canas/La Mulata is not a safe place. They love to tout it to foreigners, bc it is secluded and relatively inexpensive. I have a great friend here who was looking for a place for himself and his Canadian gf, and when he asked about security, the agent said, "Well, do you have a big dog?"
It is a long schlep into Sosua; the road getting there, via moto, taxi, etc., is horrific; and it is "secluded." It is very beautiful, and quiet, which is a premium in Sosua. In some parts of the world, secluded is a good thing, but in the 2.5 world of Sosua, it is definitely not a plus. It means that it is well-known to the local ladrones as secluded, and it takes a long time for the police to get there, if they even bother.