Well, for an alfetta, minimal rust includes any that are still recognizable as a car.
Good things:
Rare
fun to drive
cheap for an 4 cylinder alfa
they sound cool
they handle well, and tons of suspension parts (swaybars, springs, quality shocks like bilstien and koni, poly bushings for everything, etc) are available.
bad things
Rust, rust, rust. They were rusty from the time they were new, and you can watch the holes get bigger. They are just made from bad quality steel, so all you can go is keep it inside and repair it as it gets new holes in it.
Probably the most poorly made of any alfa
Lots of no longer available parts, like glass, any trim stuff, although the engine and suspension isnt too bad.
There is a part in the steering column (a coupler thing) that has rubber in it, and when the rubber wears out the steering wheel and front wheels dont nesessarily point in the same direction. The part is also NLA, so you either have to repair it, or adapt something else
Spica mechanical fuel injection is probably fine if its running good, but has the potential to cost $1500 to replace everything that could be worn out.
If you dont mind rust and rather poor build quality, and you can keep it inside, buy it, it would be fun as long as its not too rusty.