counter question; good for whom? The woman herself or the man?
Some men prefer women who stand or crawl in their (the mens') shadows.
Others prefer women who are not at all possessive, one's who are tolerant of parallel partners. But is that really "it", "it" being the kind of relationship most want? I think not.
What a man believes makes a good woman depends on expectations that each particular man has.
And whether or not these can be fulfilled by that particular woman (or any woman) depends on the woman's character and her expectations.
In general it's empathy (includes noticing what he likes and supporting or at least not ruining the experience for him), respect for his thoughts and decisions (some women try to dictate what a man does or wants to do).
Men also like women who stay in shape and who strive to look attractive ( of course not every minute of the day). Women also like a partner who stays "sharp".
Partners tend to let themselves go after a while, a huge mistake that opens the door to discovery of alternatives (if only sexual). So staying in shape is a part of being a good woman (or man). It's like a persons way of saying that their partner is worth it.
The secret to being a good woman is being one who is happy. And the thing that makes a good woman is her own good feelings about herself, her life and the people and experiences in it.