We had a great stay at Florian's place. Nice location, close to everything, clean and quiet. Florian was very responsive and helpful as well. We ran into some mild glitches with the WiFi, but it worked out in the end. If you are travelling by car and looking for a place to park, we would recommend using a parking garage such as WIPARK Westbahnhof that's 5mins away, instead of using the parking on the street in front of the building to avoid some pretty high fees.
Overall, we would strony recommend this spot to those visiting Vienna!