We had a great time staying at Gosia & Adrian's place. The apartment was clean and exactly like the pictures. Gosia & Adrian replied to our messages really quickly and we appreciated the precise details on how to self check-in.
It was very calm, except sometimes we could hear the ambulance really loud from the inside.
We were not really familiar with Vienna's public transport but the place is between several bus stations and 2 metro stations within about 10min walks.
To sum up, we enjoyed our stay in Vienna!