I think if there are :
- love between each other , which is stemming from heart , not from usefulness or profits .
- strong relationship .
- tending to make each other happy .
- tending to do or exert best efforts to help each other in life issues .
- spending enough time in making common understanding of there thoughts , reflections and feelings.
- Joint support in educating and upbringing there children , with seriously assuming responsibility towards meeting the demands and requirements of good education and upbringing .
I think they will be so happy . But if there is the converse , happiness may not be present , or may be imperfect .
I wrote that from the reality of my life and experience , I am very happy with my wife , and exerting more efforts to make her more happier and satisfied . She is the best wife in the world , she made and still making her effort to make me happy . May Allah bless her and our lovely children .