Had a very short stay at Sebastian's place as we were only in Vienna for one night, I was a bit confused by the advert as it mentioned a bed, but only an airbed was available and was set up in the lounge, I ended up sleeping on the couch as it was too noisy on the air bed when either of us rolled over (two friends travelling). The couch wasn't comfy at all sadly.
Sebastian was extremely helpful with check in and giving us plenty of information about the apartment and the surrounding area/places to eat and visit which was great, he mentioned how to turn on the heating, which we did in the evening before we went to bed then turned it off before sleeping which was a mistake as it was very cold during the night in the room.
I would recommend this place for only a short stay if you're on a small budget, it is located in a good area, about a 10 minute tram ride then a 15 minute walk to get into the city :)