CPH-Flyer is spot on with his answers!
the overhead bins in F are not aligned with the seats. the one most in front is partially over seat 1 and the rest over seat 2. and yes it is smaller than the overhead bins in J on the main deck but larger than the ones on upper deck
ask the flight attendant, whether you can put your carry on in the closet/cabinet in front of the F cabin
seat in row 1 have the most privacy