Hopefully one of our expats in Hanoi gets back to you.
In the meantime, have a look at the Accommodation in Vietnam page for a bit more info, you might also want to have a look at the Cost of Living in Vietnam page.
The average price of an apartment in the city is around AUD 540. So, AUD 350 seems like a faily good deal. I would get photos of the apartment, inside and out, ASAP before making a decision though.
Most expats do live around the West Lake (or Tay Ho) area, so it seems like you're headed in the right direction.
Good luck, and enjoy your experience!
Expat Health Insurance
Cigna Global Health Insurance.
Medical insurance specifically designed for expats. With Cigna, you won't have to rely on foreign public health care systems, which may not meet your needs. Cigna allows you to speak to a doctor on demand, for consultations or instant advice, wherever you are in the world. They also offer full cancer care across all levels of cover, and settle the cost of treatments directly with the provider.
International Movers. Get Quotes. Compare Prices.
Sirelo has a network of more than 500 international removal companies that can move your furniture and possessions to your new home. By filling in a form, you’ll get up to 5 quotes from recommended movers. This service is free of charge and will help you select an international moving company that suits your needs and budget.