We enjoyed our stay in Nedjeljkos' and Karina's beautiful room. At first it seemed as if there would be a lot of traffic noise, but the windows isolate the noise extremely well. We had no issues with sharing a bathroom as long as it was clean (which it was). Karina's recommendations of what to do in Vienna were also very helpful ;)
The apartment is not located in the city center but a metro-station which is only a 1 minute walk away, compensates that.
I would recommend this apartment for everyone coming to Vienna!