When going to the coast of El Salvador I'd definitely recommend El Zonte over the others as, say, El Tunco: it's quiter and more relaxed.
In El Zonte, Esencia Nativa is the best value; there are others, but more expensive.
EN offers private rooms and a dorm; I slept in the latter and were very conent. The mattrasses are great and it is relatively airy.
The pool's great, the bar is good and the food fantastic - what do you need more?
Oh, and the beach is very nice as well.
I'd go there again!