Design features for older adult living alone in a small apartment.

Consider a situation in which an older adult you know well lives alone in a small apartment. What are 5 design features you would want to see in that apartment in order to reduce the chances that the older person would sustain a serious fall?     https://www.youtube.com/watch?v=JgQxQ9Bn6Hk https://www.youtube.com/watch?v=n8s-8KtfgFM