How can couples maintain harmony when faced with significant life changes, like moving or changing careers?

Why do Americans, like my family, find inexpensive shared accomodations so awful, and rail to get them removed from their neighbourhoods? While in Europe, plenty of professionals will stay in them? Does removing them cause homelessness?
How does the quality of healthcare in Canada compare to other developed nations with universal coverage, such as Australia, France, Germany, Japan, and Switzerland?
How do you navigate a relationship with someone who has different love languages than you?