The flat is conveniently located (3 blocks) from Ottakring U3, and you can also take the tram just one block away. Cross the street and you will find a supermarket, so location is really great. The place is ok for families with kids (2 adults and 2 kids) but it is a bit cramped for 4 adults, for instance.
I would say that Birgit's place is good value for money - a good place for a stay in Vienna.