We stayed there for a few nights in May. It was clean, not luxurious -- sort of U.S. motel chain standard. The breakfast was OK but I wouldn't recommend taking lunch or dinner there. Hotel has two pools, only one was operational, no one was ever in it except the families of the employees. There was cold water in the jacuzzis, but from our experience this seems to be typical in Latin America. No beach on the property; so-so beach within walking distance. Basically, it was fine for what we paid (= cheap!).
We dove with the on-site operator; no complaints about their staff or service. The diving conditions were terrible when we were there, with visability of less than 20 feet and a strong surge. And, beginning the third day, it rained torrentially and almost ceaselessly for the remainder of our trip. Sigh.
There is pretty much no place to go and nothing to do in Playa Flamingo, so definitely rent a car. The much larger town of Playa Tamarindo is only a few minutes away. We split our trip between the beach and the mountains (Arenal Volcano) which is something to consider, since Costa Rica has some many land-based attractions.