We have traveled with this ship twice, 2016 and 2017, and we are booked on a cruise this year (2018) as well). In 2013 and 2014 we traveled with River Cloud 2, which is a sister ship to Royal Crown, previous named River Cloud (1).
If you want entertainment, or if you require a gym. Neither if you want all inclusive or like the American style. And if you are the type that always want to have more than you pay for you should perhaps choose another boat.
What we enjoy so much on this unique ship is that very special atmosphere, we have never ever seen a ship that comes even close to this. When I walk on the ship at night I feel like Great Gatsby. You also meet new friends on a boat like this. There are so many interesting and friendly fellow travelers, you never ever run out of conversations topics.