Johann is one of the most helpful hosts I've ever seen. He made sure he was there to let us into the flat and helped with the small but important details, such as commute and parking. He was so kind as to help us get our luggage up to the accommodation, bought a Parkschein for me, and took me to the Park & Ride facility to park the car so that I could save a considerable amount. (Parking is very expensive and not straightforward at all in Vienna.)
Also, the flat is quite spacey and located fairly close to the centre. If you don't feel like going anywhere at the moment, you can buy any food in the neighbourhood. There are several supermarkets and smaller shops just a few minutes away by foot. Overall, quite a decent choice for any traveller. Thank you, Johann!