For the guests who come to our apartment, such a walk-through room would be a good solution. It would have a sofa, as well as a table and chairs. Flowers and beautiful pictures on the wall.
I personally don't like a walk-through room. I would simply close a door, then it is a room and can be used by the family. As a guest, I would feel uncomfortable if I had to sit first in the walk-through room until the hosts receive me.