After having a light coloured rug in a room with a log burner, I would definitely suggest going a darker rug. No matter how careful you are, smoke, soot and dirt off wood will end up getting on the rug and ruining it. At least a darker colour might not be as noticeable.
A dark rug will definetly make you're living space feel warmer and cosier. A darker rug will be more durable.
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If your chairs are ivory, a dark rug will provide nice contrast and anchor the space. As you have dark trim around your windows a darker rug will also tie in better with the windows. I'd go darker.
Hi Jaye, I really like your rug choice, it's dark enough to anchor but has enough detail to not look like a big, solid block. Kind of cosy colour and feel as well.