Depends on what you consider "usual" furniture and how big (or small) the space is! Some people are pack rats and cram in way more than they need! Use common sense. Or hire a stager or a Realtor who also does staging.
I think a moderate amount of furniture is good. It helps people get a feel for how big (or small) the room is.
For example, in the living room I'd put a couch (or loveseat), maybe a chair, a coffee table and maybe a lamp and some accessories. I wouldn't fill the space with more furniture like end tables or sofa tables, or multiple couches.
For a small bedroom you wouldn't want to put in a king size bed, plus side tables, plus dressers! I'd put in a queen bed and a nightstand and that's it.