Capt Pit Bull
I agree with you - €700 - €800 is correct for reasonable rental property (excluding utilities etc).
The problem is that on the salary offered for a new instructor it will be difficult to survive unless you have additional income.
Even with the tax advantages of integrating the rental cost with salary leaves scant free income to pay for those necessities of life and to enjoy a 'professional' standard of living, car and the like. The figures simply don't add up.
Back to my original comments - it's a job for a single, young instructor or for a semi-retired airline pilot with a pension to rely on.
For those in the middle, difficult - for those with a family nigh impossible.