We had a wonderful time at Franz’s place! The apartment is extremely spacious, new, clean and cozy, and at a wonderful central location, at a walking distance from Vienna’s center. The hosts were very responsive and helpful!
It is good to keep in mind that there is only one key for the front door of the building that all the guests (the hosts have other apartments in the building as well) need to share and put back in a box at the entrance, which might be inconvenient if someone forgets to put the key back in the box - this happened with us late in the night, but the hosts were very responsive on the phone and helped us resolve the issue in around 10-15 minutes. Other than that, it is also important to mention that there is an alarm system in the apartment which can be activated if you are too loud and you might get fined.