Communal living is a challenge. I was just reading a thread about triads on another poly-focused forum, and I thought this quote might be helpful to you:
". . . many people looking for "moresomes" have little experience with roommates, & that rarely recent. It's a sweet little fantasy, but the reality of opening up your house & your life to a new person minute-by-minute is far more difficult that mere sex."
Just be as prepared as you can for the possibility of unforeseen bumps in the road.