I had a terrible experience on the flight from Marrakech to Paris with Babies sitting in front, next and behind me. I usually travel in planes with kids zones so those without kids can travel in peace. However, the kid behind me constantly kicked my seat, one time I even spilled my drink because of it. I asked to be seated elsewhere but was just told the plane is full and kids are like that. I thought the reply from the flight attentendant was rude as there could have been an easy solution as the father of the kicking child was sitting next to his wife and the passenger next to me with the baby thought it was normal that kids kick, so if the passengers behind me had swaped seats we all could have been happy, but my concerns were completely dismissed.
While I can appreciate that these sorts of experiences are somewhat subjective, the flight to Frankfurt from Paris was even worse as the plane was completely dirty - the ventilation areas had black spots that returned a wet wipe black and next to the seats were week old crumbs and dirt. I asked for help with more wipes but had to wait for the wipes for almost the entire duration of the flight. The flight attendant was also quite unfriendly about the issue saying it was not her job to clean the plane - well as a passenger it certainly is not my job either, it is actually a health hazard for me as I suffer from mold and dust allergies.