"How is your husband?"
Translation:Kiel fartas via edzo?
Estas means 'to be' while fartas means 'doing'. To ask how well one's husband is, you have to ask how they're doing, not how they're being.
Then what does mi estas bone mean? Does it mean that I am doing well or that my character is good
I suppose the exact same English sentence could also mean "what kind (of person) is your husband?" (= HOW IS your husband?), which is why I'm wondering if "Kia estas via edzo?" could also work as a valid translation. Without any context, this is quite ambiguous.