I would trust the Japanese authorities much more than some Austrian with an axe to grind.
Not sure I would agree with that. The Japanese authorities don't have a great history of honesty in the previous nuclear accidents. Don't forget, they will attempt to save face at all cost.
Being only about 200km from the reactor I am more than a little concerned. However, unless there is a catastrophic failure of the containment building I think we are relatively safe.....
In any case, people shouldn't be travelling to Japan unless they are on essential, disaster-related business.
South of Tokyo should be fine... But I would avoid the Tokyo area at all costs. A large number of the trains are still out of operation and the city is just a mess because of it. Oversold flights are leaving with 200+ seats open because people can't get to the airport.