We had a great stay at Yago's apartment!
The location is convenient and quiet - only a short walk from Paseo de la Castellana and the Bernabéu stadium, but the area is residential and well-equipped for longer stays. There are plenty of nearby markets and restaurants, and there is plenty of kitchen equipment in the apartment if you prefer to cook for yourself.
Inside, we found the bed to be comfortable and loved the patio, which was a great spot to relax in the morning before a day in town. Check-in and check-out were both very easy and quick, and Yago was always available in case we had any questions.
We'd definitely recommend Yago's place, particularly for longer stays (we stayed for two weeks), and would love to return in the future!