The property was fantastic and incredibly spacious, which included a kitchen and a common room. The rooms are far enough from each other that each person in our group had a high degree of privacy. The location itself is very convenient and allowed us to check out most of Vienna's attractions with ease. The most interesting sights were never too far away.
The only snag was during check-in and check-out. I was given the wrong instructions for checking in, but I was able to sort it out quickly by calling the host. However, this resulted in an issue later while checking out since I didn't remember the code for the lockbox and I was never given updated instructions. On the day of check-out, I called the host repeatedly for the code but couldn't get a response. It was only by sheer luck with my friend fumbling with the code dials that we managed to re-open it.
The host eventually got back to me thirty minutes later. In hindsight, even if we hadn't figured out the lock by blind luck, it wouldn't have impacted our itinerary. However, I believe that once we received the wrong instructions at the start, we should've received the correct instructions in an update. It was also partially my fault for not remembering the code, but I do believe that a fallback should've existed to prevent this from happening in the future.
While much of the review revolved around this snaggle, it's a 5% inconvenience from an otherwise 95% amazing stay. One excellent feature is that the property has direct elevator access, which made going in and out incredibly convenient, and I would almost give the place 5 stars for this feature alone.
If you plan to stay in Vienna, I recommend this property whole-heartedly.