If you are willing to stay at the countryside the best is to stay at a Pension.
Here you can bargain a bit and of course it varies from season to season and pension to pension.
I know a Family of 3 Persons paid about €250,- for a 1 week stay in a pension close to my place. I hope that gives you an idea.
There you can get into contact with the locals, get reall austrian food and it's rather cheap. Theme: Pension/GuesthouseComparison: least expensiveDirections: You can find them all over Austria, though it's not likely to find any in a city.Other Contact: It's hard to give exact info, bu