We came here twice during our stay in Arenal. It's located nearby the Christian supermarket. When we went, they didn't serve beer so we went to the supermarket to grab a couple of imperial.
The female chef is always there. She handles the kitchen and grill on her own. Quite impressive.
We ordered the jalapeño steak, ceviche, Tostones with guacamole, Casado with fish and all of them had great flavor and tasted fresh. They have this smokey tasting BBQ sauce that is to die for. So good. We should have asked to bring home a bottle.
The menu is in Spanish and English which was helpful because the servers barely spoke English. They also have pictures which helped us decide.
Price is fair relative to other options in the area. I think because they didn't serve alcohol, they are losing some customers. So make sure to stop by the supermarket beforehand and you'll be all set.