Location: the apartment is located very close to the Castle of Schönbrunn and in general it was very easy to access the entire city of Vienna. We were with car and we could easily find parking spot in the street.
Since apartment is located at the corner, at nights the street noise is very high, so if you are sensitive to noise, you basically cannot sleep.
Check in: checking in was very nice and easy. Sascha and Maria gave us all the necessary instructions.
Cleanliness: The flat was very clean and everything was very tidy and in order.
Communication: hosts were accessible during the entire period of our stay. They were incredibly respectful and helpful.
Internet: Internet was relatively fast and reliable. We only had a bit of issues during oyr first night but that was due to internet service provider and not the hosts.