All the things we needed were already there (eg: cables for recharging and premade coffee to drink). They have taught of it already and Tiago seemed very nice and ready to help us with everything.
The placement is incredibly good, quite central, near a metro station (and the metro in Wien is amazingly well connected) and to the Mariahilferstraße area.
Only problem was that being at ground floor, sometimes strange noises were heard, but not during the night or very early in the morning, so not very inconvenient.
I can't speak for the main guest because we only texted with them, but as mentioned, everything went smoothly.
It was a very nice apartment and we would gladly recommend it.