we did have a great stay in Maria and Alfredo's flat. When we arrived the place was very clean, beautifully kept. It has a nice view, feels bright and warm with windows everywhere. A good neighborhood as well, there are some nice cafes and bars which look trendy but not too expensive. And it was very quiet from the flat, apart from the new year's celebration night, we didn't hear any disturbing noises.
Our host Maria was very helpful, she was very considerate when I asked an early check-in, and when we met she gave us all the information necessary to spend one great week in Madrid. A very pleasant stay indeed, I strongly recommend this flat if anyone stays in Madrid.