I think rows 2, 3 and 4 are best. In row 1 you are close to the lavatories/galley and in row 5 you may be close to crying babies in Y ... It's not really two mini cabins, since there is no full "wall" behind row 3 and in front of row 4. The cabin devider ends at about 1m40cm from the floor, which means you can look through.