> - don't have seats otherwise people will sit down, and sitting down is the party killer

I agree with all your points but this one. My parties go for hours, people wanna chill. Usually there's some corner playing board games or smoking hookah, it's the perfect couch scenario and a great way to let a party go loooooong. People's feet get tired! Also I've had all sorts of all ages, people with MS or whatever else, pregnant people, etc.

I would say split your house or apartment into sections, just like clubs do: the biggest area is the music area, the kitchen is the stand around and snack and have ridiculously deep conversations area, wherever the couches are is the smash bros / hookah / just take a break area, the balcony or backyard is the smoking / drunk wrestling area. Definitely no seats in the music area. And NEVER let someone bring a guitar.

Yeah agree, sections is great, I've had people sit on the floor when they get tired