Oceania Sirena receives high praise for its attentive service, excellent food, and comfortable accommodations, especially for those who prefer smaller ships. Guests consistently highlight the friendly and professional staff, well-maintained cabins, and a relaxing atmosphere. However, some reviews note areas for improvement, such as inconsistent service in certain venues, limited dining hours, crowded buffet areas, and slow internet. Excursions and port experiences are mixed, with some guests finding them overpriced or poorly organized. Entertainment is generally appreciated, though some find it lacking compared to larger ships. Overall, the ship is recommended for its quality, value, and intimate cruising experience, but expectations should be managed regarding excursions, internet, and specialty services.