That looks like it is a 777-200. I have not flown on that flight, but the seating configuration on the UA website appears to show restroom walls on either side of the plane in front of Row 16, and galley wall in the center in front of Row 16.
Row 16 is an exit Row, so if you are on either side of the plane there is extra legroom because it is an exit row. You have to be able to meet qualifications to be assigned a seat by the exits.
I did not find a thread on where else to sit on this aircraft after search. Row 39 Exit Row looks ok.
Perhaps someone who frequently flies that route will be kind to reply?
For seating, the definitive list of threads is here:
http://www.flyertalk.com/forum/unite...e-threads.html