Our stay here was absolutely wonderful. The place is sparkling clean and equipped with necessities for all daily routines. It is very cozy and without noise so we slept really well. The location is really good and approachable, close to Mitte so the airport transfers and metro are nearby, city bike station is also near which was really convenient for us to go around the city. Center is ~15min of strolling and Hundertwasser is almost just around the corner. In 20min of walking, you can reach Prater park as well.
Special mention goes to Reiner, our host. He was very polite and welcoming, gave us all the info we needed and even more! Recommended a lot of great places nearby (Menta was great, thanks!) and was very responsive and communicative. Keep up the good work! If the apartment is available next time we visit, it would definitely be our choice to stay here again!