I loved this place. I stayed at this place for ten nights and enjoyed every single day of it. Very clean, very quite, nicely located on first floor, and equipped with everything that you would need for your stay.
Rainer was very good in regards of communication. I was not sure about the time of my arrival but the check in went really smoothly. By the time I got to the place Rainer was waiting for us outside so it made it easier to locate the house. During our check in he was nice enough to go over the map and suggest us some places.
I am a clean freak but this place was very neat that I couldn't complain about its cleanliness. The fact that there is a washing machine in the apartment makes this place even more like a home, so you don't need to worry about bringing extra clothes during your trip. You are provided with extra towels, plenty of them, and extra linings.
For the location, it is conveniently located near main stations. For first couple of days I was mainly going to westbahnhof to take the train but later I started using strasse #18 which is like within 200feet. Smart phone users download the qando vienna, you will love the app. You can just put your destination in and rout it, it will give you the detailed info about ubans and strasses that u need to take.
I highly highlyyyy recommend this place.