My girlfriend and I stayed for 3 nights at Sunny apartment, and it is really Sunny, take my word for it. Helene and her husband made us feel at home. Apartment is great for couples. It is located in very nice and quiet part of Vienna, about 1-2 minutes walk from Niederhofstraße Metro Station (U Bahn), and pedestrian street Meidlinger Hauptstraße where you can find all kind of shops, and everything that you need for everyday life (shops like Hofer, Lidl, Interspar, bakeries, etc). Also Schönbrunn Palace is near. We had a great time in Vienna, and I strongly recommend Helen's apartment. Location, accomodation, near shops, are something that we prefered, and this apartment has it all.