The phrase "to complement any room" means that something, like furniture or decorations, is designed to go well with and enhance the appearance of any type of room. Full definition
When choosing your perfect floor light, consider unusual or modern pieces that will complement the room design and add a feeling of luxury to your surroundings. (houseology.com)
This table lamp embodies a natural yet subtle refinement that will strikingly complement any room decor. (1stdibs.com)
The bed is a good starting point, but the décor around it must complement the room as well. (thefashionablehousewife.com)