Great location! Easy access to public transportation. For example, very quickly you will discover the convenience of tram #49 and bus #13A to take you to many tourist destinations and the main railway station (Wien Hauptbahnhof), too. When you've begun to join the dots of where things are, you'll discover the subway/U-Bahn stations for the U3 and U6 lines and other transportation are all well within walking distance.
Neubau is a distinct neighbourhood, just "steps away" from where the main touristy crowds hang out. Quiet but peppered with cafes and restaurants (and stores) that you can have quiet dinners in "your" neighbourhood. It's a great feature.
Christiana is a lovely host. You will get everything she describes on the Airbnb website - that is for sure. We found Christiana very responsive to our inquiries and considerate in her interactions.
The apartment is great - bright, spacious, nicely furnished and has all the amenities you'll need. The airconditioning works - very important for a hot Vienna summer.
Highly recommended!