Stefan's apartment is just wonderful! It is very clean and spacious with a lot of natural light, the bed is very comfy and the wardrobe has plenty of space.
The neighborhood itself is very nice and close to the city center. Either way, you can take the metro, which is only a three minutes walk from the apartment. Nearby there are a lot of shops, markets and restaurants.
We didn't get to meet Stefan personally, but he checked on us several times and it was very nice of him. Overall, it was an amazing trip to Vienna and I highly recommend Stefan's place!