Our stay at Mary & Kiki's flat was very nice. The space was comfortable, quiet, modern and well located for easy access to subways and park. Check in was efficient but communication with the hosts was sometimes slightly delayed. Maybe this was because the flat was managed by a larger company so it did lack that personal touch. They had their own portal for check in and check out and communication so it was just an added step over the Airbnb platform.
Previous review of the sofa was accurate, however - it was quite firm LOL!
The only real sticking point for our stay was that checkout was quite early (10am). You can request a late checkout for an additional fee of 15-19 Euro but unfortunately it was denied in our case. I understand that late checkouts can't always be accommodated but hauling our luggage to a train station for storage isn't convenient or secure. Offering this flexibility would have allowed us an extra few hours to explore Vienna rather than spending the entire day at the airport. Regardless, thank you for a lovely stay.