Lina has welcome us in her very nice 2 bedroom appartment, on Cava Baja, a very lively street (with many bars and restaurants, and close to a covered market), few minutes walk from Plaza Mayor. We found as a gift on the table a nice bottle of red wine from Madrid at our arrival. :)
The appartment is located in the courtyard side of the block, which makes it really quite (even when the street is full of people in a Friday or Saturday night ^^).
From the appartment you can reach most touristic areas downtown just by walk.
We spent there two nights for a 3 day stay on a week-end.
This was really perfect !
We definitely strongly recommend you Lina and her appartment !