Perth could be a great fit for your family—it's got that laid-back vibe you’re after. The city’s arts scene is surprisingly good, with the Perth Cultural Centre bringing together the Art Gallery of WA, the State Library, and the WA Museum Boola Bardip. There’s always something on, from theatre and live music to the big Perth Festival each year.
Getting around is reasonably easy, thanks to the Transperth network of trains, buses, and ferries. The free CAT buses in the city are handy for exploring, and the train lines make it simple to reach family-friendly suburbs without dealing with crazy traffic.
If your kids are into sports, they’re spoilt for choice—local clubs for footy, cricket, netball, swimming, and more are everywhere. Plus, the city’s full of outdoor spaces like King’s Park (one of the biggest inner-city parks in the world) and the Swan River, perfect for picnics, kayaking, etc.
The Western Suburbs (on the river/ocean) are expensive for housing. But Fremantle and the surrounding suburbs are a standout—full of character, with a mix of old-school charm and a buzzing arts and dining scene. You’ve got superb public schools in the area (but catchments are strict, so check the Department of Education website maps carefully) plus lots of stunning beaches and parks and heaps of free or low-cost festivals and activities for all ages. Fabulous bookshops too. It’s the kind of place with loads to explore and a real sense of community.
Australia is expensive overall, as other posters have mentioned, but there are great lifestyle compensations in Perth/Fremantle. And as a teaching couple you should get jobs quickly, though you may be on contracts for a while.