Rhine Discovery (Rhine Getaway), Basel to Amsterdam, October 2015 on the Viking Sun.
Just returned from the holiday.
Second tine with Viking but as this was a different class of ship at a different time of year I’m not going to compare the two.
Basic room 170 sq ft with water level window. More than enough room, again very well appointed (no fridge unfortunately). Our maid (Jenny) was excellent, visiting the stateroom several times every day ensuring the room was always tidy.