Maureen is super nice host and always ready to help!
Appartment is located no more than 10 minutes walk from Wien Mitte rail station, that's very convenient cause you have access to underground, S7 or CAT to airport and to Wien Hbf you can get with tram 0 from Radetsky platz.
Room is spacious and can be suitable for familly of 4, but keep in mind that closet is tiny.
The only problem I faced with was the kid (or two) next door who was screming and running and playing musical toys all the time, literally.