We have really been a pain for Cedric & co. Mostly because or organisational reasons.
Cedric, who co-owns the apartment with Teresa, was very communicative and willing to cooperate.
Before arrival we received an e-mail from Thomas, who manages the place. He left us the key(s) and made sure that we could enter the apartment. Very pleasant.
The apartment is located at "the other side" of the river Danube. Thinking about it afterwards, I would've preferred to stay at the better side of the city. The apartment is, however, easy to get to by public transport. One other consequence of its location is the amount of traffic noise that reaches the apartment. It's situated directly next to a busy road and it's more than likely that the noise will wake you once the city wakes up as well.
The apartment itself is large and furnished, but it's clear it's only meant for Airbnb use. Upon arrival, the place wasn't too clean, unfortunately.
Altogether, our stay was good. Mostly because we weren't in the apartment that much. Only to sleep and have breakfast. If that's your plan: go for it!