I am currently booked on PE from HND to FRA (LH717) which is 748 config.
I usually prefer the aisle seat and at this stage I have an option of selecting 21C, 21H, 24C or 25H.
Due to the close proximity to the lavatories, I am inclined to avoid row 21 altogether but this is my first time flying LH PE and I don't know which are the best seats to pick out of these options. Thoughts ?