Some good points in this thread, but i'd say:
Hardwood floors w/ a rug > wall to wall carpet. Not feeling the color or spill some sh!t on it, just cop a new one. Plus you gotta keep your carpet clean or your chick will be sneezing up a storm.
You need those blackout curtains. Window treatments in general are expensive as fcuk, but it helps contain the heat in the winter, and keeps out warm air in the summer. Plus, not all chicks are exhibitionists, they want that privacy.
I'm big on underlighting - it's a small thing to do and really hooks up shelves or cabinets. I'm also big on mirrors and wall decor. I throw them joints everywhere.
I cop my piff from
http://www.kirklands.com/category/Wall-Decor/Mirrors/pc/2283/2306.uts.
Don't judge me.
I also copped some Warhol prints from the Met, but I haven't found any giant affordable wooden frames yet. Them sh!t's expensive...