Buses leave Carmelita for Flores and vice versa (in Santa Elena FROM THE MARKET) at 1 PM and 5 AM. It takes about 4.5 hours to arrive.
Bring a book and reading light.
There are two comedors in town, one on each side of the old airstrip. Don't expect anything of a food nature but beans and eggs unless you bring it yourself, and you will not be disappointed.
Thanks to solar energy, there are cold beers at the comedors and at some tiendas in town.
The comedor nearest the Cooperativa has two basic dorm rooms with four double beds each right behind it. Make sure that a comfortable bed is available before paying. Make sure you know exacly where the outhouse is before dark.
There is presumably a cantina somewhere in town, but I didn't go looking for it.