Looks decent. Things that stand out to me: Allspice and nutmeg aren't very common in meatballs, maybe around Christmas, but only then. That, and don't use olive oil. Either only butter, or a more neutral oil. Most importantly, don't cook the meatballs in the sauce (huge no no). Could also add some pressgurka:)

But honestly, make them just how you like them. The most popular way of eating them here in Sweden is buying frozen ones at the store and eating them with pasta and ketchup