This is indeed a very nice apartment in a recently renovated older house, which still appears practically new - the photos give a very good impression. The bedroom has the window out to a narrow courtyard/light well, but this also protects it from any street noise. In any case, we hardly noticed the neighbours or noise from the street. The apartment is very well-equipped, and we also enjoyed having a full kitchen and the luxury of a dishwasher. The bed was large enough, even for my 3XL frame, and the rest comfortable and very well kept.
Louise kept very good contact and any questions were resolved easily, she was also making a great effort to help us with a few requests.
The quarter around the apartment is a normal residential area with an evident mix of nationalities. Within a few minutes you can find multiple bakeries (one open 24h), a good, traditional butcher, supermarkets, but also a store with Indian food or a Turkish place, besides shops for about any necessity. We enjoy this kind of mix and just in case you are concerned, everything felt pleasant and safe to us - like Vienna in general.
Public transport in Vienna is excellent and comparatively cheap. Besides the U4 line mentioned in the description there are tram stops for 3 different lines even closer which will easily connect to other lines bringing you to Vienna's main tourist attractions while having a view of the surroundings.
Our personal tip (also found in the apartment) is to eat at least once in the very nearby Restaurant Zwischenbrückenwirt. The menu is only in German (no issue for us), but the food is very good, the wine selection great, prices are reasonable and on two different occasions we had a very friendly service.