Be prepared to relax... really relax. The cruising experience is quite joyful; we slept with our doors open with warm August wind wafting in as we glided down the Danube (at an average speed of 18kp/h). During the day the view is constantly changing and the locks (which have been on the Danube for close to 150 years) are fascinating. We went through locks 12 times and during the day the 15-minute process always attracted a crowd on deck.
You pretty much don't have to lift a finger if you don't want to. Your room is cleaned to a spotless state twice a day and crew members (mainly East European) will absolutely insist on fetching for you, this may feel unnatural but it's easier to go with it. You will feel pampered in your room too. High-end French toiletries are in the bathroom, the shower has mains pressure-like flow and the robes are luxurious. There is plenty of wardrobe space (and, as we were reminded a few times, more hangers available).
You can pre-pay gratuities but anything extra is appreciated by the hard-working crew you have contact with. It is not awkward, even for Kiwis.
You don't need to pack much but being able to unpack what you have brought is wonderful. There is plenty of storage in ingeniously designed rooms. Do take something smart to wear at night, or to a concert. While laundry is pricey to have done on the ship, it's an option if you run short of clothes.
Don't be late. When the scheduled departure time comes, the ship leaves. A 10-minute departure delay can cause several hours' delay further along the river if a vessel misses lock bookings and docking opportunities. The all-aboard time is very clear and easy to meet. Just two people missed it on our seven-night cruise and fortunately for them it was a short hop to the next port. further down the river.
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Avalon Waterway's eight-day 'Danube Symphony' cruise from Passau to Vienna takes in charming small towns and exciting cities. Prices start from $4320pp.