Just one and a half cents on this; Someone on Koningsdam dropped the ball on the OP's luggage being misdelivered to their "old" cabin. When a guest cabin is changed, be it due to an upgrade, a cabin temporarily inhabitable due to, say a broken water pipe, or for whatever reason, and that change occurs prior to that particular guest's luggage arriving onboard, which seems to have been the case here, that particular luggage is flagged in the system. Based on that "hot tip", it is supposed to be set aside inside the terminal/on the pier during the luggage "boarding" process by the stevedores, and/or inside the ship's A-Deck Marshaling Area by a HK supervisor, and either a new tag(s) with the new cabin# is stapled to/over the old tag, and/or the old tag's cabin# is stricken though with a marker, replaced by the new cabin#, and brought to that new cabin by Housekeeping staff. That didn't happen in this case! An oversight!
Secondly, the interaction between the OP and Guest Relations staff at the Front Office could have/should have been more professional. Now, if the OP and her DH approached the Front Office prior to All Aboard time when guest luggage is/was still being hauled onboard, and some of that luggage, as most of us know, is taken to the infamous "Sin Bin" aka "Naughty Room" for secondary inspection by security, I can see where GR staff did not have all the options available to them.
Having said that, at a minimum, someone from HK, i.e. a cabin inspector (and yes, those hard workers are very busy on turnaround day) should have been dispatched to the OP's cabin to physically check and eyeball if the OP's luggage had arrived inside said cabin (or in the corridor outside) because those valises were still adorned with the old luggage tags. If that was the case, as later on was confirmed by the OP's DH in cooperation with the "new" guests of that cabin, some ill will could have perhaps been alleviated.
I wasn't there! K-dam's Guest Relations could have been very busy on embarkation day with very long lines in front, something that is not unusual on that particular day! Regardless, an opportunity lost by K-dam's GR staff resulting in added aggravation by the OP and her DH
OH yeah, and has already been stated, the spaces "below the engine room" are uninhabitable! As a matter of fact, there are no living spaces whatsoever, not even a brig for dress code violators ðĪŠ, underneath the engine room! It's not very comfortable down there, hot and noisy being a good description, but you can, at times, get a nice look at aquatic, anamniotic, gill-bearing vertebrae with swimming fins and a hard skull, but lacking limbs with digits, from below the ship's waterline ð