We did the 15 day cruise from Venus to Rome and it was absolutely fantastic. We are an older couple in our 70's and liked the small ship size. The customer service was excellent. The food was superb and the staff was super friendly. We ate mostly at the buffet and the food was always fresh. We did pig out at the sushi bar as it was the best we have ever had.
We will definitely cruise with them again.
The only nit that we had was we used the spa several times and we were restricted to a 45 minute time limit due to COVID. The 45 minute limit was to allow a small number of people in the spa at a time. This really wasn't a Viking problem, just a COVID precaution to reduce virus transmission.
What was not to like? The cabin was spacious with great amenities. The room stewards were great. They were always asking us if we needed anything and whenever we asked it was provided.