Iaia was a great host and the appartment is exactly as we expected : not big but enough for a couple, with a bed under the roof and everything you need to spend a few days. It is situated in a nice yard, very typical.
Iaia waited us until 00h30 to open the door and leave us the keys. She answered every e-mail during our stay and helped us in every way she could.
Last but not least, her handmade guide of where to go, where to eat, where to shop in Madrid is full of good tips !
To say it short, it was a great experience.