It depends on what you're after. If you want to be the first person off the plane (i.e. have a tight connection at LAX), you probably want to sit downstairs. If you like the upper deck, then it's ok. It's the last row on the right, the closet and toilet are just behind you. Personally I prefer row 16 because there is no seat in front of it. The only seat I really try to avoid is 19K because it is right across from the toilet.