The apartment isn't close to the central station. It's 3 metro stops away and an additional 5-7 minutes walk from the metro itself which is troublesome if you have a lot of luggage as we did. In total it can take about 20 minutes to Hauptbahnhof door-to-door (depending on metro frequency). The main attractions in the inner city are a further 2-3 stops away so it can take 25-30 minutes to reach places like the Hofburg Palace or St. Stephen's Church. The location isn't bad but if you're expecting to be smack in the middle of the city then this isn't the right choice.
For the location and the amenities (no washer, dryer, shower gel, etc. Only hairdryer and handsoap), the property is a bit on the pricier side. It's very clean and the hosts are very friendly and accommodating. They arranged for fans upon request as it was really, really hot. However, it is possible to find better alternatives for a cheaper price. This apartment is perfect if you are a big group of 5-7 people and prefer a quieter area.