This was our second time on QM2 (the first was 5 years ago in her maiden season) and we requested - and got - "our" old cabin. We had expected to see some signs of wear but this was limited to the cabin doors having settled a bit, allowing light to bleed through the bottom of the doorframe (easily fixed by placing a bolster across the doorway!). She remains a beautiful ship.
We were disappointed at the number of places where it is still possible to burn tobacco and had to breathe in the fumes even outside the main entrance to the Britannia restaurant on Deck 2 Stairwell C, where it reeked of old ashtrays. Hopefully Cunard will follow P&O's lead on this disgusting habit and confine it to more limited areas.
The food was excellent, as always, but the entrees at dinner were now of a proper portion size. Five years ago, they were very small (even our waiter then commented on one particular meal and brought us another portion to bulk it up) so well done to Cunard for sorting that out.
5195 - close to Stairwell D on the starboard side (inside cabin). Despite proximity to lifts and stairs, we never noticed any noise from passengers going past to their cabins. Very clean and tidy. Perfectly adequate with respect to size, with good hanging and drawer space.