Apartment
The apartment is large enough for a comfortable stay for a family with two children. I note that we are used to living in an apartment of this size.
The apartment is on the ground floor, which may be a problem for some. By this, I mean the sounds of the street, such as pedestrians talking or the drone of passing cars. Personally, it didn't bother me. It is not a busy street, and the sounds make you feel the city atmosphere better.
The apartment is spotless and well-equipped, starting with all sorts of pots and ending with the iron and ironing board. The only thing that can bother you on hot days is the lack of air conditioning in the apartment. In short, a good option for both short and long stays in Vienna.
Communication
The host is really helpful. It applies to the check-in and other aspects such as parking or recommended restaurants. Whatever we asked about, we received a comprehensive answer in just a few minutes.
Localization
Within 50 meters of the apartment are a grocery store, bakery, and metro station (5 stops from Stephansplatz). The place is well-connected to the city center so in my humble opinion it makes no point in driving around the city by car.
There is a parking lot along the street in front of the building. You can park for 2 hours there to unload your luggage. Due to the limited parking time in Vienna, the car should be reparked in one of the guarded car parks which are available in the vicinity. As the crow flies, it is 100 meters between the apartment and one of them (Würtzlerstrasse - APCOA; EUR 6 per day). However, the cheapest option I could find is Erdbergstraße Parkhaus, which is located 900m from the place of stay. Parking there costs EUR 3.6 per day. If you are having trouble finding a parking space, there are other options like an underground car park underneath TownTown's residential buildings on Erdbergstraße.