The apartment is approx 15min walk from Vienna hbf. Can be confusing to find the location of this apartment for the first time even with Google map. Taxi cost us €15 for such a short distance. When you come out of the train station, walk to the left until you see a large map which we didn't notice!
When we arrived at the apartment approx 17.00, it was not ready but the agent allowed us to leave our bags. We walked back to hbf and bought the 48hr metro tickets to go to the main Stephan platz (U1) where the main shopping areas are located. You can buy this ticket from a machine at the station but not from the information office. The apartment is very clean and comes complete with all the amenities. It has a large balcony. It easily fits 4 people. Don't be disheartened with its distance from the hbf as this is a lovely apartment. The walk to the station is on a flat path alongside a small park for children and joggers. Using the same tickets, we went to Schonbrunn Palace using U1 then U4 metro on the next day. Overall, we had a lovely time in Vienna staying at this nice apartment.