I stayed at this apartment for 5 nights. It was a last minute trip and Adriana was very accomodating with check in when my arrival time changed at the last minute. It is a lovely apartment with shops, supermarket, cafes and even the open air Brunnenmarkt nearby. For me the location was as good as I'd have preferred. It is 30 minute walk or 23 minute tram/ubahn from Stephansplatz. There are 2 tram lines nearby that can take you to the ring road.
My biggest issue was the lack of wifi, I spent a lot on roaming charges during my stay.
Normally I am a quiet, unobtrusive guest, however I had to contact Adriana a lot during this stay: things like how to work the TV (it doesn't work), how to do laundry (washing machine is in a room on ground floor with a special card and you bring your own powder), how to check out (you have to put keys in drawer near entrance and take your rubbish to a room on ground floor), so maybe a information booklet for guests would be a good idea. Overall I can recommend staying at this apartment, it is clean, good value for money and Adriana is very a helpful host (just need to bring a good wifi or roaming package on your phone)