The apartment is 12mins walk from Keplerplatz Metro Station and only 5 mins walk to nearest Lidl.
Neighborhood is safe and quiet. Have a very good sleep here. You have your own key to lock your bedroom outside and you can also lock inside at night so it's very safe.
Vasu is a great host. Had good communication during stay. I arrived in early morning but have no problem checking in. Sometimes the main door is locked during the night so better let Vasu know in advance and he will wait and greet you in the house.
Vienna is an amazing place. I would definitely pay a second visit and have a second stay in Vasu's apartment.