Avalon Waterways' Seine River cruises receive overwhelmingly positive reviews, with guests praising the attentive service, gourmet food, well-organized excursions, and immaculate ship conditions. Most travelers found the experience exceeded their expectations, highlighting the professionalism of the crew and the quality of the accommodations. While a few guests noted minor issues with specific staff members or aspects of the excursions, the overall sentiment is that Avalon delivers a first-class river cruise experience.