We absolutely loved Maria's attic flat. It is full of character and just right for two people. However, it's the terrace which really makes the attic special - it has amazing views over Madrid and is perfect for enjoying a nice cool drink after a day's sightseeing or for eating breakfast on first thing.
Maria was a great host. She arrived promptly at the agreed time, was helpful and very welcoming yet left us to it for the duration of our stay. The flat is located in a really central place - the trendy area of Malasaña with its huge selection of cool cafes and bars. It is also a short walk to Gran Via, Madrid's main thoroughfare.
I have absolutely nothing negative to say about the flat at all and (especially once the lift is installed as planned) I would recommend both the flat and Maria 100%.