Cristina's place is great! Super well located (right in front of an U4 station and the Naschmarkt), silent and clean. The way to the flat since the entrance door is a bit strange and can be confusing, but nothing to worry about. Even though we only stayed for a few days, It has everything you need for a long stay. Communication was always excellent and Cristina always answered super fast. She also helped us looking for a cheaper place to park the car. If you want to have a cozy, clean, silent and well located place in Vienna, I definitely recommend Cristina's flat :)