I had an absolutely wonderful stay at the flat. It's perfect for a morning stroll at Naschmarkt, lunch with friends at one of many gorgeous little cafés in the area (try Vollpension!), a 7-minute walk to the Staatsoper in the evening and home office in between. Check-in and check-out were completely fuss-free, the flat was spotless and with Karlsplatz just around the corner, public transport couldn't be better. Thank you!