We stayed 4 nights and it was a great stay in Vienna! The apartment is a little smaller than imagine but it was good enough for our family, two adults and two kids (6&9 years old).
There was everything we need and it was so much cozy apartment for us.
The equipment around kitchen was enough to cook everyday.
Oh, I remember just one thing, we hope kitchen knives would be better next time...
Its access was very good, a few minutes walk from nearest station, and we could go everywhere in Vienna within 15-30 minutes.
Hannes was a great host and kindly explained everything we asked.
So, as a conclusion, it is worthy to stay if you want to enjoy Vienna!