This is a nice apartment with a friendly and welcoming host. The pictures depict well the spaces, furnishing and condition - there is some (normal) wear and tear in the sofas / wood floors, but its minor. The nearby mini market is indeed convenient, and more so is the larger supermarket at the nearby train/metro station. The latter opens on Sundays, a rare find in Vienna, as others have pointed out in earlier reviews.
The apartment conveniently located, only 3 metro stations away from downtown. The area is safe - we booked the apartment for several weeks for our daughter, and she had no incidents... though at first you may wonder, due to a couple of bars in the vicinity and the presence of some vagrants at the train/metro station - as a guy I would not have given it a second thought, but as a father I was a tad concerned... but, as it turned out, she had no problems during her stay.
Bottom line: Would we book it again? That is a yes.