"Decent" is very subject as it can mean different things to different people. I recommend that first you figure out what your price range is, then use our Crime and Commuter maps to help figure out which neighborhoods are going to be the best fit for you.
Our Walnut Creek Crime Map can help you see what crime rates are like ahead of time: http://bit.ly/X4eRV5
Our Walnut Creek Commuter Map can help you figure out how long it will take for you to get to work from any of the homes you see on Trulia: http://bit.ly/124F79k
And finally, heere are all the rental apartments we have in and around Walnut Creek for you to choose from: http://bit.ly/124Fcdd
When you have more follow up questions, I'd recommend that you try and be as specific as possible so as to give you the best chance of getting the answers your looking for.
Good luck with your search!