Javier is a great host. I had no problems staying for about a month in his apartment. The apartment has everything you need. Very good equipped.
The location is perfect. A lot of supermarkets, cafes, bars around the house.
Very close to metro L2 station, which will get you yo the city center.
The window is not an external, but I had no problems with fresh air because the kitchen has a real external window right opposite the internal one.