Agree that row 15 (and row 1) are probably the least desirable rows on the 343. Have you checked on the actual seatmap for your travel dates if you are on one of the 2 ex-Iberia 343's, which do not have a row 5 but also do not have horizontal flat beds but 'slopey seats'. That would be much more disappointing than ending up in row 1 or 15!