The location is great, 5mins walk to the nearest U-Station. There are some restaurants nearby too. The main drawback to the apartment is that it feels a bit dated; that is fine if you are just in and out, using it for sleeping only; however, if you wanted to cook as a family or spend more time there, you would want something that feels a bit more loved.
The apartment block also seems full of other AirBnB or similar as many people are coming and going at all hours; the central courtyard gets quite noisy, especially if it's hot and you have the windows open.
Overall though, the location, price and everything else, the apartment is great if you just need somewhere to sleep and set up base while visiting Vienna.