On the line's "international" vessels, expect to meet fellow English speakers from a range of countries. The line's emphasis on active shore excursions and the presence of a full gym and spa reflect the German passion for health and fitness and as a result the average age of passengers falls on the youngish side, with couples in their 40s and 50s commonplace. A-ROSA also welcomes children and families (children under 15 sail free), so there are often multigenerational groups onboard, particularly during school holidays.

Ships have a relaxed atmosphere and there is no set dress code. Comfortable, casual clothing is suitable onboard and during excursions. Bring warmer clothing for evenings on deck, plus comfortable walking shoes as many towns have uneven, cobbled streets and steps. Some passengers like to dress up for the specialty dinners in the restaurant, but full-on cocktail attire and evening dress can be left at home.

The "international" cruises offer the highest level of inclusions, with air and transfers, wine with meals, anytime cocktails, Wi-Fi and a selected number of shore excursions all included. Also included on most sailings is one specialty, waiter-served dinner; these dinners are restricted to 40 people and must be reserved ahead of time. Three or four are offered per cruise and passengers may pay to attend more than one. Other additional charges can include additional shore excursions, fine wines and Champagne, spa and salon treatments, shop purchases and laundry service. Mainstream (i.e., German-speaking) sailings have fewer inclusions and so are ideal for those on a tight budget.

A-ROSA's main attraction isn't confined to shore tours, though excursions are still the most popular activity for cruisers. With the river industry's largest spas, as well as top-deck pools on the newest vessels, many passengers choose to stay onboard and enjoy these facilities. During school holidays there are also children's clubs. At night, cruisers enjoy lively entertainment, with entertainers who sing, play musical instruments, host quizzes and games, and spin popular tunes guaranteed to get people on the dance floor.

Best for: Rediscover the world with NCL