Dominik is a very kind and helpful host. The location of the apartment is good, although the room was a bit noisy from the traffic of one of Vienna's main roads.
Room was ok for 1 night, the whole apartment seemed a bit like a low-cost hostel with a number of rooms. The main issue was, that there was only one bathroom with sink for a huge number of people and it was occupied for quite a long time in the morning - so I came to late for my seminar this morning because of this situation.
I can recommend the place for young travelers with low requirements and plenty of time.