The apartment is a small nice apartment perfect for a couple or traveling solo!
It can be shared with more people but that could be a bit uncomfortable.
It has everything you need and is not bad located (in Vienna is really easy to go from one place to another because of the great public transportation system)
The communication is not the best, ask for the instructions to get into the building before your arrival in case you don’t have Internet!!! (I had to wait a lot and then had to ask someone for a móvil so I could called Harry) Also I think the host has different flats so he won’t give you recommendations and not always will answer on time. For example, I asked him for indications for my departure and didn’t get any answer do I left the keys in the door and they had problems opening the door because of that. My mistake I know, but precisely that’s why I asked! And of course he was a bit rude because of this)
There is a door inside the apartment and they where fixing something in the building so there was a lot of noise during the mornings and it was a bit creepy that the sounds seems to come from the door. But at the end nothing happened :) except that you wake up early (I bet this is temporary, just ask anyway)