Oh my, I am just about ready to book the Amsterdam for the Panama Canal in Nov and just read all of the posts about bad plumbing and service!! I believe the cabin I will be in is on Dolphin Deck - I am going on the Single Partner Program so may or may not have a cabin mate. That is a little scarey - thinking about sharing a cabin with someone I don't know - but the time frame is right and the single price is certainly right - if there is a toilet!!
I went ahead and booked and just heard back last night that I can have a cat H to myself for an extra 300. Great news, I think! I was a little concerned that there may be a problem with those cabins, but this is a fairly new ship, so I don't know how bad it could be. Too bad about the people who had a bad experience. I read a lot of terrible things about Millennium before I went on it myself in Feb and she was beautiful, no problems. Vibration a little noticeable from time to time, but nothing really disruptive.
Do you know anything about the difference between cat H and cat C on MsAmsterdam? Can you think of any reason that they would be willing to let the Hs go for singles at a discount?
Have you checked the location of the Cat H cabins compared to Cat C?
I have a Rotterdam deck plan in front of me and C's are on the Dolphin (lowest passenger deck, way up in the bow. C's are on the Lower Promenad Deck, admidships. I imagine the layout is almost the same on Amsterdam.