If you are looking for a professionally managed, short-term rental in the center of the Vienna, this is the perfect place. We enjoyed our stay.
The WLAN is ok for web browsing but was not usable for work because of firewall restrictions (no outgoing VPN or RDP connections, non-standard ports blocked but required by many web email clients). I had to rely on my phone's hot spot to get anything done.
Also, the fact that we only received one key and that there is no intercom created logistical challenges. The other person has the come downstairs 5 flights of stairs to let you in, and the elevator did not work on the day of our arrival (but was repaired on the same day).