I was on a business trip to Vienna and stayed at Luisa's apartments for a week. It's a great place, very stylish and clean. Amenities and espresso machine are available in shared kitchen.
Suitable for a couple on a sightseeing trip (close to the Aquarium) as well as for a business trips. Easy and secure access to the apartment, good sound insulation to the street, very close to a U4 subway station and bus station. Nearby shops, Billa and city market street.
Definitely will stay there again if I have another trip to Vienna, Luisa is a great host.