Having read all the previous reviews, I found that all the positive experiences and observations about the fabric of the ship were borne out on this transatlantic cruise.
Cunard's pricing policy on beverages encouraged me to take care of my liver function, although it was really good that Cunard are relaxed about guests having a private supply in one's cabin for a pre-dinner snifter.
We chose to travel White Star steerage class, and we found Brittania dining perfectly acceptable. The segregation of Grills and Brittania facilities/guests is not discrete; it is not my 'cup of tea' and will influence whether I cruise with Cunard again.
Obstructed view on deck 4 was fine. No noise from corridor or lifts. A/C worked well. Even with baggage restricted to 23 kg, storage space was tight.