I had that happen to me once--I was working first shift, and I swear my downstairs neighbors didn't work at all! There was constant partying until the early AM. The landlord basically told us tough luck. So one Saturday morning I got up about 7AM, laid my full size speakers on the floor, and played Pantara really really loudly until they came upstairs. I answered the door and was like "Loud? Really? Wow, these walls must be paper thin!"
That night their music was even louder. Another neighbor called the cops, and the partiers blamed me. Long story short, a long drawn-out battle ensued between me and the neighbors, and didn't end until I moved out six months later.
The way I see it, this can be avoided by:
A: moving to a different apartment and relying on luck
B: saving money and buying a house, or
C: what I did recently, spend more money for a better apartment in a better neighborhood
Of course, none of these options are 100% effective. I moved into half of a double in a much better neighborhood, but our downstairs neighbors are very
loud arguers--and they argue at least
once a day.
Oh well, I think everyone needs to pay their dues--
so they can say to their children and grandchildren--"you think you got it tough? When I
lived in apartments..."
Sorry, I'm rereading my post and seeing that it's not very helpful
. Good luck with your situation!