For a couple, choose 2E/F on the A380 and the 77W (assuming it's 'old F', the one with 8 F suites). These are the quietest suites.
On the A380 because they are further away from the galley. Although row 1 is even further, there can be some disturbance as you are close to the curtain separating the cabin from the forward 'bar' and the shower spa's.
On the 77W again because you are furthest away from the galley and there are no passengers to be served behind you. And trust me, you will not hear anything from the J cabin behind you.
If you prefer window seats, take 2A/K on both types, then you can't see each other but there is slightly more space in the area next to the window. These days, Mrs t and myself prefer this option. But then we have been married for long enough to be able to be 'separated' for a few (or more hours). YMMV.