When in doubt, err on the side of sleek, masculine, and simple. Too much of anything (scented candles, incense, throw pillows) has the potential to be overwhelming. Simple, upscale details can make even that crawl space in Williamsburg feel spectacular.
Get a mattress upgrade
I can chart my progress as an adult through my mattresses: those weird single-long beds of college dorms, hand-me-down mattresses, futons ,and awkwardly sized IKEA beds in various Manhattan apartments, 10 months spent sleeping on a waterbed in my late 20s, Tempur-Pedic memory foam, and a brand-new, custom-formulated, foam Hyphen mattress that's the most comfortable thing on the planet.