My girlfriend and I stayed at Christiana's apartment for one week and, since we were in Vienna for study/work reasons, we had the opportunity to spend long hours in the flat, using extensively all the facilities (kitchen included). This place is simply spotless: perfectly clean, elegantly and stylishly furnished, and everything works at perfection.
The surroundings are quiet but not at all boring... creative minds will surely like the area 'cause it's packed with photo and record shops, design stores and art galleries!
Christiana is a wonderful host: caring, accurate and discrete: we had some problems with check-in and check-out times and she always found a solution to suit our needs.
4 words: this is highly recommended.