We stayed at Erupciones for one night, our last stop in Costa Rica. Erupciones is located a few kilometers away from La Fortuna going toward Arenal. There are about 12 units, each in its own building. For $65 we got a medium-sized room with two beds, a/c, cable, fridge, wi-fi and jacuzzi tub, breakfast included.
A very friendly lapdog, Cici, greeted us upon arrival. The B&B has a nice blue and orange color scheme. Our room was immaculate and while the accommodations are not super-modern, everything was in good order and well maintained. The grounds are excellent for bird-watching and the view of Arenal from our front porch was a bonus. There is a small horse farm next to the inn, which I believe the owners also run--we could see a trainer exercising one of the horses in the morning.
The host, Jessenia, was helpful in arranging a discount for a day pass at one of the nearby hot springs resorts. One of the staff members was there when we arrived and, despite that fact that she didn't speak much English, was overwhelmingly friendly and helpful. They do not take credit cards.