Banken
Before the room, measure the route. Doorway, hall and the turn in the stairwell decide whether a sofa gets in at all, and the diagonal measurement matters more than the width. Then keep the sofa narrower than the wall it stands against and leave about 60 cm of walking space in front.
Weekly vacuuming with a soft brush keeps upholstery fibres open, and treating a stain immediately beats treating it well later. The cleaning code in the product description tells you what the fabric tolerates.
Finish with cushion covers and a rug.