In order to thoroughly evaluate it, one should visit the neighborhood during the day and the night. It is advantageous to talk to some of the residents to get further information. If entrance doors have glass panes, they should be small and combined with deadbolts keyed on both the exterior and interior. Don't leave your keys in the lock if there are glass panes in the door. Someone could smash the glass and then unlock the door.
Door chains are of little security value.
Window locks are also important. Keyed locks and some type of pinning device, to prevent windows from being opened more than a few inches, are best. Latch locks will offer some security. If your apartment building shares a common entrance door, it should be locked at all times. Exterior lighting is very important.