We stayed at Petra's apartment for four days. The communication with her was good, we did not find any problems,she responded always in time.
The location is not the center of Vienna but is very good connected to the center and to all other parts of the town and it takes around 20 minutes to arrive to the center by metro.
The apartment is extra clean and very bright . Everything looks as presented on photos.
We are satisfied and can recommend Petra and her's apartment for people who would like to stay in Vienna.