The apartment is very big and was really clean when we arrived ! Good location, close to the metro and a 15/20 minutes walk to Schonbrunn Palace ! It was really easy to get in the apartment thanks to the key box. You can check in whenever you want. The only complain you could have is that you can hear the cars pass by in the street and if the neighbors are nosy (listening to music late at night for example), you will hear them in the room. But if noise isn't too much of an issue for you then you'll be fine !