I am going to Aus. for 14days in coming Feb.
I think it is a good time to go there as the currency is very low.
In my opinion, when you have long holiday, you should go far place (eg. Aus), In the other hand, Japan can go anytime for few days holiday.
For Japan, it is a clean and nice place, but the currency is very high now, and it is easier to go for short holiday.