Salvatore's place is great as it is fairly close to Innere Stadt; one can just hop on the metro (which is maybe a 5-10 minute walk) and be at the Opera House in no time at all.
All the amenities listed were there, including a lift, which was nice as his place is on the 4th floor.
The bed was a bit stiffer than we're used to, but we were able to settle in after the first night.
All in, if ever we're back in Vienna, we would love to stay at Salvatore's place.