Flew with JU a while ago ATH-BEG-LHR in C. Ground service not that great but once on board excellent. Proper shorthaul C seats, pre take off drinks with warm nuts, selection of 3 hot meals of good quality, attentive crew. Would use them again without hesitation, especialy now they got their own lounge in BEG (although have not seen it yet, can't be worse than generic BEG airport lounge).