The room was amazingly cleaner than I expected! Everything we need were there, and really comfortable to stay as well.
The apartment is very close to the underground station, is located in such a safe area too. I didn't feel any danger even in the night.
Also I walked around the area and found a huge park only about 10 mins away from there. Should be the best place for walking or cycling.

And Georg, we hadn't met him in person though, we could feel he's really kind and helpful!
He prepared a folder which shows us kinda guide of the neighborhood or Vienna city.