Quality of Life in Vienna, Austria

You can live very comfortably off of 1000€ in a single apartment in Vienna. Easily so if this is referring to net income after tax and social insurance. My total groceries expenditure was at about 200€ before I switched to ordering ingredients online; it's lower now. Just don't buy unnecessary amounts of meat or fresh vegetables, they are expensive in general, and more so here.

You don't go far with 1000 Euros unless you live like a street dog.
The purchasing power index is equal to 0 imho. You pay almost three tiems the food as you do compared to Bavaria or the 50km distant city of Bratislava.
People are rather unfriendly, compared to other European and US cities.