This is a normal Australian postal address

Mr. and Mrs. {xxx}
{###} {xxx} Street-----> unit/house number and street name
Como {###}------>the subburb or city and the postcode
Western Australia---->the sate it is usually abbreviated as WA
AUSTRALIA----->for international mail I would add the country name at the bottom

So if you address the letter/card/parcel as:

Mr. and Mrs. Smith
123 Main Street
Como 8564, WA
AUSTRALIA

it will get there

Hope this helps