Sil is a very good host and the apartment was spotless. The location is perfect: just across the Donaukanal from the old town (Erster Bezirk). At the same time, the apartment is in a quiet street. The noise from the school that was mentioned in another comment is not a big deal at all.
There is a nice café/restaurant just around the corner, called Risotto Box.
We would be happy to stay at Sil's place again.