If a building or place is livable, it is suitable or good for living in.

It's not a luxurious apartment by any means but it's livable in. 这套公寓虽够不上豪华，但很适合居住。

It was rated the most livable city in the States. 它被评为美国最适合居住的城市。

able to be lived

These are the basic requirements that make life livable. 这些是维持生活的基本要求。