In a nice Area close to the Metro Station "johnstrasse" (U3). With the Metro its just about 15 Min to the city center. The shopping Street "Mariahilferstrasse" is as well pretty close.
The street is quiet, but there is in 4min walking a marked and lots of Supermarkets close.
U will have the whole flat for your self, there are additional sheets and chair for up to 5 people.