Careers where couples each had separate corporate identities, full-time responsibilities at an office and essentially separate lives for 40 or more hours per week are not completely extinct, but they are most certainly an endangered species. In fact, it is rare to know anyone who, even if they do have this type of situation at some moments of their lives, has that situation for an entire working career.
What is becoming more common is that both members of a couple have been compelled to use the skills they have developed to generate income from some type of sole proprietorship, working out of their homes.
This constant proximity can have benefits, such as increased productivity due to the elimination of an hour or more per day spent on getting from home to work. Not only is productivity increased, thus generating additional revenue, but expenses are much lower, too.
The potential for conflict, however, can take a seemingly idyllic situation and turn it into a Familiarity Breeds Contempt scenario that is anything but beneficial to a relationship.
If at all possible, separate work areas are desirable. If space is not available to facilitate this, other methods may need to be considered.
Libraries and cafes generally have Internet access and provide a quiet environment, so even if only for a few hours a day or a couple to times per week, this is one alternative. It will probably not be too difficult to make an arrangement that is equitable to both parties.
If a designated in-home office space must be shared at times, it will necessitate some adjustment to find the best set-up where the distractions created by one person, such a phone calls, do not unfairly impact the other.
The most important requisite is the patience to realise that it takes a little time to establish the best possible routine for both people in order to establish harmony.