The perfect location to stay in Vienna! The U3 line—which takes you across the old city centre all the way through to the Museums Quartier—is literally down the street (1'). It's just a 10' walk from Wien Mitte (where you can take the CAT to and from the airport), there are at least 3 supermarkets within a 3-5' walking distance and loads of street food options, bakeries, cafes and restaurants to choose from.
The apartment was really nice and comfy, perfect for a family of 4. An adequately equipped kitchen for light cooking, an accommodating living/dining area with a couch that turns into a double bed and a large and clean bathroom. Everything was tidy and taken care of. We honestly didn't have a lot of contact with our host, but their instructions and attention to detail made sure that we really didn't need to anyway. We'll definitely stay again if we're in town.
*****