-Guest policy is big for me, but hall got that.
And as sole said: LOCATION.
-Check the distance to school (if you are still going) and work, see if you can find easy routs to get to the places you need to go.
-Also check how close various stores are so you will be able to get what you need in an emergency, or just for convenience.
-Visit the neighborhoods of potential places on a Saturday or Friday night and see just how loud it might get.
-Also, check the room's location in the building, your bedroom window could be on the bottom floor, right next to the main interference, so everyone gets a good look inside.
-Also, parking. Make sure you have a good place for your car.
-Storage maybe, if you have alot of shit, some places have additional storage options.