My husband and I stayed in Eva and Michi's Vienna apartment for two nights at the end of May. Setting up the rental was easy and we were met at the flat for check in. The flat was spotless and well positioned for a 10 minute (or less) walk to the Naschmarket, Karlsplatz Metro, or the Opera House. It was very warm the day we arrived but fans were available to make the flat comfortable. In addition, the windows face a small, mostly pedestrian side street, rather than the main road, so it was pretty quiet.
We stopped in Vienna between Budapest and Prague and were glad for the opportunity to relax in this apartment and get some laundry done. There are many restaurants, grocery stores and pubs within a short 5 minute stroll. We took the Metro from Karlsplatz to the Erdburg bus station (Flixbus) and travel time was less than 20 minutes. Super convenient.