This time of year sees more than it's share of people moving, particularly young people soon to be off to school. In looking for a new place to live, this entry by Ophelia de Serres on the Girls Fight Back blog lists all the important points to consider from a safety perspective.
One point I'd add concerns renting a house with friends. I suggest that as a group you come to an agreement on guests: inviting over other friends, or new dates, or people you just met; how late they can be there; and how long they can stay (without paying their share of the rent . . .). Not only could it save your life, it is likely to also save your friendships.