Habitability is a quality of being good enough to live in. If love the fact that your city is a great place for all different types of people to live, you appreciate its habitability.
The characteristic of being habitable, or suitable for living in, is habitability. Both words come from the Latin habitabilis, "that is fit to live in." Some of the features of planet Earth that contribute to its habitability include the presence of water, its distance from the sun, and a breathable atmosphere. As far as the habitability of your bedroom, you may require nothing more than a bed to sleep in and some glow-in-the-dark stars on the ceiling.