Claptrap's Place is the first place you'll come to in Borderlands 2. After surviving a terrible train wreck, Claptrap will lead you here to rest. The rest will be short lived, however. You will acquire your first gun here before truly setting out on your journey.
This cave is essentially a one room house with a combined living and kitchen area. There are the shells of deactivated Claptraps scattered all around. Some are still sitting in chairs while others are crammed into the bathroom.