We stayed one night in this clean & neat appartment. Communication with Rosa was great (directions how to find the appartment, places to go etc.) and we met her on the spot to obtain the keys. The two of us used the queen-sized bed and a separate mattress; there would be even sufficient space to stay there as a couple with kid.
We didn't use the small kitchen but it looked adequately equipped. Rosa offered us to use the coffee machine (including filters and ground coffee) but we decided to walk over to Radetzkyplatz (2 min) where we can highly recommend the "menta" restaurant's breakfast. There is also outdoor seating overlooking the Radetzkyplatz.
The appartment is on the ground floor but we didn't experience any street noise during the night.
Neighbourhood is very nice (a church square, diversity of restaurants, frequent public transportation) and if you don't mind some walking you can easily reach the city center or the prater on foot. The bank of the nearby Donau channel (roughly 500m away) is nice for jogging.
Overall, if we are back in Vienna we would definitely enjoy staying there once again.