My sister and I did the River of Gold itinerary in Portugal's Douro River valley. I enjoyed the smaller ship designed for the river as at 108 passengers it was a nice size - not too small and certainly not too many. The crew was exceptional; I can't say enough about how they took care of every minor request or need and remembered details of each passenger's likes and dislikes. The room was small but had enough space to be comfortable and the bathroom was a good size and had plenty of shelf space which is saying a lot for two women! The excursions were very interesting. This itinerary involves a fair bit of time on buses and there aren't cities built right along the river as there are in so many other countries where Viking sails. There's a small pool - kind of a plunge pool - on the sun deck and that was a real delight and unexpected! The chef was excellent - probably the best cuisine I've experienced on a cruise.
Spotless, well-lighted. comfortable and with a lovely small balcony.