Hi lulalullabye,
I lived in Adelaide from 2005 for around 2 years. Really loved the place. Lived in a suburb called Unley, about a 5 minute drive from the CBD, lovely houses and very safe. I think the main thing that I found was that public transport was dire, had to buy a car as soon as I got there, and only used the bus once after that!! However Adelaide is very easy to drive around, not an issue like it is in Sydney or Melbourne, plus loads of car parks in the city centre.
I worked in the Queen Elizabeth Hospital which is north of the city, much poorer area with people from diverse backgrounds. The hospital was great though, and made a lot of good friends eventually.
I found Adelaide quite reserved at first, but loved the nightlife once I made friends. The restaurants and bar scene is great, very laid back and not at all "up itself", if you know what I mean.
There are a couple of shopping malls, but I mostly shopped in Rundle Mall in the CBD. Had a couple of department stores and all the main chains. I found though, that for the first time in my life I had savings after a few months, there just wasn't as much "stuff" for me to waste my money on after a lifetime of London shopping
.
I found the Aussies great, very friendly once they got to know you. I only came home cause I missed my family, would have quite happily stayed otherwise. Adelaide itself is very pretty and spent many weekends in McClaren Vale and the Borrossa which are both beautiful, especially in the summer when you start pining for a bit of greenary.
Hope you have a great time, I'm very jealous