I booked the apartament for my parents since they do not have an Airbnb account so I will write what I've heard from them.
The amount of services and optionals was amazing! All kind of accessories for the kitchen (they didn't use any but is something worth pointing out) and for the bathroom to be 100% independent, also umbrellas at the entrance (which is not that common) and a shoerack with shoeshine! Key was in a lock with a password which made the check-in fast and easy. The apartment is perfectly clean with a lot of space and all type of furnitures and is located in a quiet (and beautiful) zone! In summary there is no reason not to give this apartment a maximum rate. Note that the bathroom is connetted to the kitchen (if I understood well) but old houses are just like that and is not to be considered a flaw in their opinion nor mine. My parents only speak italian but they can tell you that the host was very cordial (thay have friends in wien so I assume they probably translated for them) and so I can tell since I was the intermediary for their booking. That is all!