We booked this cruise because of the itinerary and my wife's experience with Viking river cruises. Both the destinations and the hospitality were outstanding! The tour guides with real historical chops and the resident historians were stars. The food was on par with a legend of Valhalla (see what I did there?) We loved creativity of the Chef's Table, and were surprised it wasn't more packed.
We were also pleasantly surprised by the excellent musical talent of the entertainment; they were professional and I would not be surprised to see them in first class musical theater productions or commercially successful in selling recordings.
My only disappointment was the unavailability of spots on some shore excursions. In particular, we were unable to get in the Alhambra tour, and that was one of the top three reasons we picked this cruise.