Yes on all counts.
I took the first Quisqueya course to be held in this country and found it very helpful and very professional. I was already teaching English here and had a teaching qualification from England, but this course helped to build my confidence and to improve a lot of my practice in this country, taking into account cultural aspects etc.
When I took the course it was based in Los Cacaos so I think a lot of the practicalities have changed since then. However, Samana itself is great. We didn't really have a lot of time to go dancing as the course is pretty intensive, but I'm sure you could get in a bit of the bachata without having too many problems with Sankies. I think the problems arise for the people who don't know who or what Sankies are. Forewarned is forearmed, and even Sankies can be fun to do the bachata with......as long as it stops there.
Have fun and enjoy the course.