This should be accurate :-
https://www.aerolopa.com/ek-388-2cl
That shows just the toilet at the front. I'd trust this over the Emirates 3D as they are sometimes not quite right.
For the way back, I'd go for 6EF - mainly because I like to closer to the front (and it's quicker to exit). They're all pretty much the same anyway.
The best lounge is in the A Concourse. This tends to be quieter that than the B Concourse - but the B lounge does have the Moet bar. Avoid the C lounge as this really showing its age. You can move from one to another, although you need to take a shuttle train from A-B.