One block from the beach, the Ritz Copacabana offers contemporary rooms set in neutral color schemes with all the creature comforts (blackout curtains, minibars, oversized TV screens), plus beach service on the nearby sands of Copacabana. There's also a small rooftop pool and bar with partial beach views. It's fine value for the price.
On the downside, most rooms lack views, and even the best ones don't afford vistas of the crashing waves.