The gray sofa in Dutch interiors is a true classic. Go for a gray sofa when you assume that you will spend a while with the sofa. Gray is a color that can be easily matched with different styles and colors. Pimp the classic with some pillows with print and color. Also consider a plaid with a print.
Okay, it's going to be a gray couch. But which color is gray? A light sofa is ideal when you want to create optical space. You better opt for a dark variant if you want to create a cozy and warm appearance.