We spent great 4 nights here. The apartment was very nice, clean and well-equipped with all necessary stuff (iron, hair dryer, coffee machine, bed sheets, towels etc.) Trip to the city center and all major attractions took about 15-20 minutes, because the flat was close to the subway and tram stop. The hosts were very nice and helpful, they quickly responded to all our messages and gave us many valuable tips before coming to Vienna.
I definitely recommend this apartment!