As Ryndam is going out of service, I will confine my comments to generalisations which could apply across the line.
Boarding and reception at Harwich excellent: pity they will not be using the port any more. Parking easy, and luggage (lots of it) taken out of our hands. Facilities in the Harwich Cruise port fairly basic, but you could get a coffee and a snack, but as you will get fed almost immediately after boarding, does not matter. Boarding very efficient, and was on board 90 minutes ahead of schedule. For an old ship that had been sold on, the ship was in very good condition and could not fault the state of repair. Staff extremely helpful.
We had a cabin on the lower promenade deck where the walking circuit is. Thus you need to be aware that people will be walking in circuits past your window from very early in the morning. I can only assume that there are people who are very early risers, and even at 0600, the circuit is live. Cabins very good size with sitting area and enough room to hang clothes and draw space. No problem for a two week jaunt. Nothing much provided in bathroom except wall mounted shower gel, conditioner and shampoo, but Elemis brand. This is quite typical of the low to mid range boats and I always bring my own stuff now. Cabins cleaned and tidied to an excellent standard, and cabin steward excellent. Cabin mostly made up by the time we had returned from breakfast (they clock who is moving around on any deck). Compares favourably with other cruise liners, and we had bought the cheapest cabin available.