Buy them a Burt Weedon Tune a Day - at least that way you'll have variation! I've had issues with upstairs neighbours but they've always been reasonable when I've had a chat. Maybe invite newbies in for coffee and explain your situation. Ask if they could play in another part of the flat or offer to buy them a rug to deaden the sound?
I've negotiated it twice now when driving and haven't found it a problem. As a pedestrian, however, that crossing was always a little scary because of the two lanes - far side driver wouldn't see you until you were half way across.
While I would love to wax on lyrically about the qualities of Mr Miyagi, I must respectfully point out that Grasshopper could whup both of them at the same time, with one hand tied behind his back.
Need to see tonight's episode on catch up. I caught last week's and was mightily impressed by him. Though he cannot write music in the accepted sense, his pictorial version was breathtaking.