R-Class
These are the former Renaissance Cruises "R ships" that founder Frank Del Rio leased back out of bankruptcy to start the company — lovingly maintained, repeatedly refurbished, and still the soul of the fleet. At ~684 guests they reach ports the bigger ships can't, and the atmosphere is closer to a country-house hotel than a resort. The trade: 1990s bones (smaller bathrooms and cabins than modern builds), fewer restaurants than the new ships, and no purpose-built showpiece spaces.
Small-ship devotees, port-collectors chasing unusual itineraries, and travelers who value intimacy over hardware.
Modern cabins and bathrooms matter to you, or you want the full six-restaurant specialty lineup — that's the newer classes.
