I recently stayed at this hotel, and I had a wonderful experience. The location is excellent, being near both Karlsplatz and Stephansplatz, two prime areas for sightseeing. The tram (U1) station is just 3-5 minutes away from the hotel, making it super easy to get to Karlsplatz/Stephansplatz in about 5 minutes. It's also conveniently close to the main train station.
The hotel has a lovely restaurant called "Family and Friends," where I enjoyed a delicious breakfast. The staff was incredibly friendly and made me feel very welcome throughout my stay. The area around the hotel was quiet, and I felt safe even late at night (around 11 PM), which as a woman, was very reassuring.
Overall, I had a great experience and would definitely recommend this hotel for anyone visiting Vienna.