Veselinka is really responsible for replying. I contacted Veselinka the night before I check-in to book the room. She responded right away and allowed me to check-in earlier according to my time. The apartment is warm and clean. A lots of space. It have everything you needed. The neighborhood is quiet and safe. There is a supermarket just two blocks away. It's really close to public transportation. I will definitely recommend to stay if you are in Vienna.