Andrei's apartment was great! Cosy but with all the amenities you could want, clean, comfortable, fast Wifi, very quiet etc. We were two people and had plenty of space. The location is perfect, you can walk everywhere and can be in the tourist centre in 20 mins. There's lots of great bakeries, bars and restaurants around the apartment as well.
We didn't get to meet Andrei but communication with him was fantastic, he left very helpful instructions. Looking forward to returning to Vienna and these apartments in the future!