Sometimes floors can be less than perfect in a rental. Scratches on wood, ugly carpet, and in winter cold tile. Perfect camouflage a spectacular huge dramatic. I think my favourite ever birthday present is my incredibly lush zebra striped rug. Pretty sure people notice that first thing, and I’m happy about that.
Rugs are pretty good at hiding stains, and even preventing you putting some stains on them. They often come pre-treated. Stains on the carpet are not a good idea if you want all your bond back. Cocoa and steam cleaning still not the complete answer.
Most importantly rugs tie the whole room together design-wise and anchor the furniture.