Having lived in southern beachy Delaware for so long, it was the best with a constant mix of older, retired neighbors or weekenders. Parents lived next to a wooded lot on one side and a house on the other that is only ever opened a weekend here and there when the guy comes down. Then a big house was built on the wooded lot, but they've been the best neighbors there could be, don't mind the parent's 3 dogs barking at them through the fence, and everyone knows each other's dogs names, hello greetings everyday. Mom locks herself out of the car...can go next door and use the phone, etc. Easy, quiet, the best.
Philly has been great so far too, thanks to choosing a great building. Really only one crazy neighbor, the first one I met and who was quite helpful to start. From Barbados, in law school...but in her 30's...doesn't work to the best of anyone's knowledge, etc. We think she just sues people. Started a ruckus about mold in the building (built in 2008) and specifically her apartment, and has told/made up crazy stories about other neighbors, what she's done to past neighbor's cars she didn't like, etc. Everyone just knows her deal and leaves it be...until she drives you crazy about whatever the mold alert is (nothing in my realm, so I don't want to get involved), alas. Barbados, of course.
Next door neighbor can get the wall booming on Friday/Saturday nights with his entertainment system watching movies, but he's cool.
Talk to them again...and if that doesn't work, then try the next avenue. Civil is always good first, even if it gets old when it's the 8th time.