Franzi was a fantastic host, very friendly and easy to contact. He met us at the apartment and gave us extra, local information and suggestions.
The apartment is very close to the city centre, 10-15min walk from both the centre and the nearest train station.
The location feels safe, as does the whole city(!), and the street the apartment is on is really quiet.
In addition to the usual sightseeing and restaurants in Vienna, we would highly recommend eating at the Palmenhaus in the city and taking a day trip to Bratislava old town. This is only an hour away on the train and under €15 per person!