Size should be a consideration, but the mood you are looking to create and the level of light in the space are far more important to consider. Dark hues such as burgundy are wonderful for bringing a real sense of opulence and warmth to a space.
Consider adding a palette of richer colors to create a cocooning space that you can relax in. You could paint all four walls in a dark, inviting hue of burgundy, using a lighter shade on woodwork or alcoves with the same undertones to add contrast. These colors work beautifully in any space in the house which you would like to feel intimate and restful.