We were 4 persons and stayed four days.
The position is extremely good as it's only three minutes walking to U1-Nestroyplatz.
Building outside may not give a great impression but the apartment is really good.
Very cleaned, well equipped and in general very comfortable. The area is really quiet even if being only two metro stops from Stephansplatz.
Also, a nice big shower.
We didn't have the chance to meet Rebecca but communication was perfect, extremely convenient the possibility to have free check in thanks to the safe box outside.
Rebecca was very nice to allow us to check out in the afternoon.
All in all an extremely positive experience, highly recommended.