My office is in the same building as my apartment  (also have a shore house, but don't work when we are out there).  Separate unit, not a home office.  My wife is the only person who works with me.  So besides the reasons you said, it's also, I don't have to get dressed up anymore.  Used to "look the part" on the days clients came in (I would see them 3 of the 6 days we are open this time of year) and then the other three days, just wear shorts and a T-shirt since I didn't have to leave the building.  My wife still does make phone appointments, rather than in person.  Find it easier than calling them whenever and then they are not there, etc.  But, if that works for you, then that's great