A dwelling is a house, a room or set of rooms, or other structure where people live: A tepee can be a dwelling, for example. An apartment is a room or set of rooms where people live: that is, it's a part of a larger building. An apartment is a dwelling, but a dwelling is not necessarily an apartment. I live in a big dwelling located in the center city sounds odd. If the dwelling is an apartment, you should just describe it as such.