Christian's apartment was very nicely furnished and I had a pleasant stay for my night in Vienna. There is ample public transport around the place and it is only about a street and a half away from Luger City which is a shopping centre. You can walk to the centre of Vienna in about 15 minutes. Everything was clean in the apartment and I met Christian as I was checking out and he was very pleasant.
The only thing I would say is note that there is a 25 euro cleaning fee. It is clearly marked on the listing though and Christian kindly reminded me before I booked as well.