Just my own personal experiences in the past and the only thing I've found on this specific 777-300 is 16 A or K, whilst it has unhindered seat access and you'll probably get some decent sleep, it gets very busy in your area about 45 minutes to an hour out. And your right, WTP passengers use these loos (although they shouldn't)

Personally, I'd now take row 12 as I like the middle of the cabin. Row 10 has a window blank. Overall though not really much in it and CW is still a great place to be.

See this:

https://www.aerolopa.com/boeing-777-300er-type-77g

Pete