The location is very good, especially if you plan on visiting Vienna for the Christmas Markets. We were 3 couples and one friend, so the layout of the apartment wasn't that ideal for privacy. There is only one room in the apartment upstairs that has a door that can be closed. The other two big beds are downstairs in the same room, one just being up some stairs (visible in the pictures). Also, when we arrived it was pretty cold, especially downstairs. But the hosts were very responsive and turned up the heat (possible only through them, remotely). Once the settings said 23 degrees, it was ok. Still, downstairs it was chillier than upstairs. A thing to keep in mind.
All in all, I think the location is great for visiting Vienna. I'm not sure there are better options at this price and with these many beds.