I arrived close to midnight and Robin kindly welcomed me (I had of course informed him earlier). Communication with him was seamless, which was really appreciated! Robin and Marc's apartment was amazing! The room was spotless and had everything you needed, even your own coffee machine. The private bathroom (and separate toilet) was also really spacious and everything felt brand new. If you time permits, spend some quiet time in the morning on their balcony with lots of plants. As for location, it is located within 7 mins of a walking to the closest metro station that brings you to the city center in under 20 mins. Two supermarkets are basically within 2 minutes of walking distance. Everything was perfect and I highly recommend this place for anyone visiting Vienna! Just a small tip for light sleepers, the apartment is close to the main roads but with ear plugs, you don't hear a thing ;)