I have the medium (4 cup) one. 25 grms of coffee, espresso grind, lightly tamped gives me my best results…
+1, although nines a 2 cup as the missus doesn’t drink coffee (wierdo) not tamped down like you would for an espresso machine, just pressed in enough that it’s consistent.
Warm, not boiling water, it needs some time to warm the whole pot up otherwise you’re putting boiling water through cold coffee and it won’t work and the espresso will end up cold because the top half of the pot wasn’t warmed up.
And get a stainless pot, aluminium leaves a funny taste.
And remove it for the heat when it’s nearly finished, better to have 10% less coffee than 100% horrible burnt stuff.