The Apartment is Wonderful in a perfect location.
We (2 Adults & 3 Teens) used it for our first visit in Vienna and were very pleased.
For us, the location was everything. We walked the city center up and down and nearly did not use public transportation. Never the less all major lines are in less than 100 meters from the apartment.
Check in was very easy and intuitive, the apartment is fully equipped and it is very spacious.
There is a supermarket next to the apartment which is very convenient and we cooked and ate internally.
To conclude, the apartment is highly recommended for families (or any other group of people) that want to be in the center of Vienna.