Partition your bedroom/living area with curtains.
Or push your couch against the bed to trick yourself into thinking the rooms are separate.
Get yourself a floating desk.
A trunk is a coffee table AND storage space.
Replace your swinging doors with less invasive sliding doors.
Or forget the dining table and install a simple dining bar.
A slide-out pantry will free up space in your cramped kitchen.
Put shelves over your doorways for additional storage space.
Invest in dual-purpose furniture like this chair that’s also a bookcase.