We had an outstanding experience from start to finish at Florian's flat.
Host: Florian was very rapid in his responses to all of our communications and he was friendly and informative at check-in. He also responded very quickly to a couple questions we asked during our stay.
Flat: The flat was perfectly clean and welcoming. Florian has a washing machine and a space for hang-drying our clothes which was much appreciated. We used the fully stocked kitchen to make a couple meals and found everything we needed. The flat is a true 1-bedroom flat, meaning the bedroom is separate from the living room/kitchen and has its own door which was very nice so that one of us could sleep while the other was up if wanted. Florian provided a pod coffee maker and lots of pods of coffee which was very nice for the mornings. The Wi-Fi was fast and reliable.
Location: The location was outstanding as well. Very close to two different streetcar lines, or even within walking distance of the historical 1st district (~45 minute stroll). The Augarten is a great place to go for a jog or walk, and the WWII-era flak tower emplacement therein is quite a sight to see that may be off the normal tourist guides for Vienna. The supermarket (Billa) right nearby had everything we wanted for making lunches/dinners. All in all, it took about 30 minutes by public transport to get from the flat to anywhere in the first district. We used the LineNetwork Vienna app, by the way, to plan our public transport routes. The building housing Florian's flat is on a traffic-light street and literally across the road from a grade school, and we always felt (day or night) that the neighborhood was safe and unthreatening in any way.
Overall: 5/5 stay in all respects, definitely book this flat for your stay.