Bottom line: The host Milan was helpful and attentive to our needs. The apartment did not really work with our family's needs and maybe more suitable for adult, budget travelers or short stays.
The apartment is appropriately furnished, the beds are comfortable.
The building is old and has no elevator which may be an issue for those with small kids, bulky luggage etc.
The area is diverse and mainly residential with good access to transportation and stores about a 1-3 minute walk away.
The apartment is remodeled, nicely furnished and equipped with basic necessities. The new bathroom is the highlight of the apartment as it is all combined (rare in Vienna) with a comfortable toilet and updated shower.
There was a troubling moldy smell upon entry that even got on our clothes. The host was helpful and responsive to our concern but the smell never went away.
The bedroom has a window that opens up to the main staircase. This made it very difficult to sleep well because of the noise and light produced every time someone walks in the building even with a blackout curtain.
Overall, great host but the apartment didn't work for us completely.