Love the design of the apartment, very funky and cool, and was a great use of the space available. We loved it, but just be aware that you have to climb up a ladder or crawl through a small space to get to bed.
It was located slightly out of the city but was still very close to public transport (only about 15-20mins to and from city centre).
Josef met us at the apartment, and we had a very entertaining hour-long chat with him about Vienna, politics, and how to tip. Thanks so much Josef for your hospitality, we had a great time! :)