Ciao Adriano!
to IIS, mate!
Before I answer your question, I have to ask you a couple to give you the best situation.
How long will you be spending here in Sydney? From your date of arrival, the next new Moon will be in early January.
Will you have a car to get around with? If you want a really dark sky, like with Roma, you need to be more than 150km away before you really get minimal light pollution. Coonabarabran is about 450km from Sydney.
What type of telescope will you be bringing, or will you rely on something from here in Australia to use? How complex photography will you want to do?
Dangerous animals? Not really at night. Dingos don't come near people, and are very shy. Snakes, if you see them, will only be during the day. Mosquitoes are them main proble. Some can be the size of pipistrellos,
.
You might want to contact some of the astronomy clubs listed here under New South Wales. These people might be your best help:
http://www.iceinspace.com.au/clublistings.html
Alesandro