We just returned from a wonderful Grand European itinerary on Viking's Neptune, a sister ship to the Europe. In fact, there are four "sisters"--The Neptune, Europe, Spirit, and Pride--all nearly new, having been built in 2001; all accommodating up to 154 guests in 75 ocean-view cabins. The ships are lovely; the crews are excellent. The staterooms are laid out nicely and really utilize space well--even the bathrooms!
While we were docked overnight in Vienna, a couple of guests on the Best of Europe itinerary came to visit us from the Viking Europe--and they confirmed that the ships were identical!