These images were taken from a decorating magazine for 70 years. In all cases, a large expanse of space is for what might be called couch, but in reality it is not. Its exact name is “conversation pit”. And the name is very appropriate because it is a space on the floor covered with mattresses and pillows.
No doubt its practicality is questionable in terms of cleanliness, as it requires no shoes policy, which can be discomforting to some people. Could also be uncomfortably for women in skirts.
The choice of large sofa with storage underneath is actually a good idea. Although these projects require something that most people do not have: large spaces. However, this type decoration of the 70 rooms is certainly very nice to enjoy great comfort.