Just empathizing with the bastard neighbour experience:
As the piano dealer that we purchased my piano from said; people who can't tolerate the sound of a piano should go live in the woods.
Recently, at 9:50pm, my downstairs neighbour came ringing my doorbell. I go open the door, there's an oldish lady taking her first glances at me, as I look back with a wondering expression on my face. She proceeds to start a flow of ugly words and other "powerful" expressions to explain the torment that my playing has forced her to go through.
"Don't you realize that we can hear it ?!!!!"
- "Well, I wouldn't annoy you on purpose would I"
"YES YOU DO!!!!" - starts backing off back to her hole
- "I do have my own motives for playing you know"
After this, I wrote a note and took it onto the message board, it went somewhat like this:
"If you're agitated by sounds from the piano, I would advise you to let me know in time so there's no need to come cursing at me later. Although the time of silence lasts from 10pm til 7am, I am - in all my flexibility - ready to negotiate practice times. I would also like to remind, that despite possible contrary rumours, my intention has not at any point been to purposelly irritate people.
Sincerely, <name>"
I even left a "Suggestions" field down below, but nobody has come up with any great ideas so far, so I decided that its not my fault if some hag that's frustrated with her life is pissed off by my playing, as long as I play between 7am and 10pm. My dad also came over to build a soundproofing to the wall behind and floor beneath the piano, and since its a silent model, I can now practice at nights too.