I stayed there a few years back. "Rustic" is how I'd describe the lodgings though they may have done some remodel work since then - call and ask or check things out before paying. The pools are stone lined and vary in temperature. The creek's right there to cool off in. Its a great place to soak.
I'd recommend it for anyone but the type of folks I refer to as the "sanitized-for-your-protection" people. Its really great to be able to haul yourself out of the hot spring pools and then go right to bed. I've seen it with moderate crowds but it all depends on when you're there (holiday vs weekend vs weekday, etc.).
Nothing in the world is more yielding and gentle than water. Yet it has no equal for conquering the resistant and tough. The flexible can overcome the unbending; the soft can overcome the hard. - Lao Tse