You are staying in St Kilda...no need to travel far and wide....there are a tonne of lovely eateries on both Fitzroy St and Acland St........ Acland St area is known for cakes and cafes......Fitzroy St lovely restaurants some pricy some not....You will have no poblem finding great eateries in St Kilda. Try this
link
If you venture into city......there are some great cafes at Southbank, Federation square and at Crown Casino...as well as some laneways in the city where there are some very
European laneways with paninis and expresso...I love Degraves St..
Southbank/Southgate: I like Blue Train but see this
link as well as a map of the southgate precinct which is by the river and great to get views
Crown: Automatic, Grecos......Pub at Crown
Federation Square: See this
link I like the cafe "Time Out" right in heart of city opposite Flinders St Station...
I would stay away from Docklands eateries they are pretty average I have found and Docklands is very cold so take a warm jacket if you head there..