It was a wonderful stay here in Astrid's.
First of all, it takes around 10 minutes to Staatsoper on foot; it is that near to the center. I could wander around until 10 pm in December by my self.
And she keeps the place clean and artistic. The bookshelf full of various books, pictures on the walls, small lights and decorating items inspired me.
Lastly, she was really willing to help me stay well in the place. She even draw the way to get to the city center, and let me practice using the key of her place.
I hope I could stay in Astrid's again if I get a chance to visit Vienna again.