We enjoyed our stay very much! The location of the apartment is fantastic with just a few minutes walk to reach Bahnhof Altstetten or any of the several other bus or tram lines. Still, it's very quiet during the day and at night. The apartment was very clean and the kitchen was well equipped. Perfect for four people!
The only two points to keep in mind: the ceiling in the bathroom is rather low and the doors in the apartment are sliding so you can hear very well what is going on in the other rooms.