We really enjoyed our summer stay (2 months) in Vienna!
The apartment is really quiet –at some time you hear some kids playing during the day but at 10 everything was completely calm for a good night sleep- and has everything you need for a short stay: a really clean fridge, washing machine, microwave, coffee machine, toast machine, TV etc. The shower was great too. The building was not very well preserved, but the apartment was fine. It didn´t have any view but it was super luminous. Marcus received us at the agreed time for check in, and for check out we just left the keys in the safe box outside the entrance door. At half our stay, he came really soon when we ask him to change a couple of burn lights.
Even though we did not like Favoriten district, the location was safe and super practical to get to the center of Vienna in just 15 minutes. It is just one block and a half to Reumannplatz metro stop. You also have a really nice Billa (supermarket) one block away; and a larger one (Merkur) 4 blocks away.
Also Wifi was super-fast!
To summarize it is a good place at a reasonable cost to stay in Vienna.