Apartment very well located !
You have the metro U6 right in front (Karlsplatz: 15min / Schönbrunn Schloß: 20min), you also have several tram/bus lines right next to it, or you can even walk to Westbahnhof station (U3, S-Bahn) where you’ll find many restaurants and shops.
The apartment has everything you need, it is very bright and peaceful.
Be careful though, it is mentioned so read carefully: 3rd floor without lift.
Warmly recommended !!