When we cruised the Danube on the AmaDolce it was one of the best trips we've ever taken. We knew we wanted to experience another river cruise and after much research we chose the Rhine. These two cruises are very different however, and what we loved about the Danube was not always present on the Rhine (plenty of time to enjoy the port cities for example). Despite the differences, we thoroughly enjoyed our time on the AmaSonata. It's a beautiful ship in perfect condition, staffed by dedicated and friendly professionals who really know how to make their passengers feel welcome.
We spent several days in Amsterdam on our own before the cruise and hired our own taxi to the ship. If you don't use an Ama airport transfer to the ship, you can find the embarkation location printed one the cruise voucher.
We arrived ahead of the 3 pm check in time, but embarkation was smoother than our previous experience. We waited in the lovely lounge where they had water, tea and cookies. Check-in includes having your photograph taken (later on, a credit card is requested prior to check-out). A crew member is assigned to each guest to carry the luggage and provide a cabin orientation. In our case, this crew member was one of the dining room wait staff. Later on the first day there is a Captain's welcome reception with drinks, introductions of key crew and a safety briefing.
Our cabin was on the Cello Deck - a bright and pretty stateroom with a surprisingly spacious bathroom; very generous closet space with safe, terry robes/slippers and umbrellas; a built in desk/table with a small fridge and limited storage; a computer/TV monitor; two club chairs; and a queen size bed with dual nightstands (each with lamp and two small drawers). It's cosy, but for the most part it is well designed. The under-bed storage is difficult to access with the tight space at the balcony door. As a result, we were not able to stow our largest bag, which gave the room a more cramped feeling. Having the outside balcony is definitely a luxury, but be aware that during twin dockings (and sometimes triplet) they're useless. And on this topic, there is no way to know which side of the ship will be paired with another ship, so it is the luck of the draw depending on river traffic. When they are docked together you can literally touch the other ship and obviously see into the cabin if the drapes aren't closed.
We toured Rudesheim on our own and enjoyed it very much.