Liz Kiernan

Before my boyfriend and I decided to move in together five months ago, I lived in a three-bedroom, one-tiny-bathroom apartment on Fifth Avenue in Park Slope. I was living with two roommates--one friend and one we met through Craigslist.

Our apartment was railroad style, so there was no hallway and the rooms were connected to each other. In total, our rent was $2,000 a month, but my roommates and I split it based on bedroom size.