Natalie's place is great and we have enjoyed staying there. It is about 5 minutes walk from the U4 Friedensbrücke and also really close to the 31 tram that takes you close to the city center.
The apartment is as shown on the pictures, clean, renovated, pleasant and comfortable.
Walid (the co-worker) was a big help and we have arranged with him to picked us up from the airport and also to drive us back.
Thank you Natalie for the great place and the tips you have left on the table.