A small room tip before buying a bigger sofa: mark its footprint on the floor with masking tape.
Then walk through the room. Open the door. Imagine carrying a tray past it, or pulling a chair out from the table.
The dimensions on a product page tell you whether something fits. That little walk tells you whether the room still works.
I would rather leave a bit of breathing space than fill every available corner. Sometimes the most useful part of a layout is the space you choose to keep empty.
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