I stayed at Joaquin's apartment for nearly a couple of weeks, as I recently started a new job in Madrid, and I really enjoyed it.
The apartment has an excellent position, not so far from the city center, only few minutes walking from the metro station and it's located in a neighborhood plenty of shops, restaurants and services.
The apartment is really nice, comfortable, fully equipped and super clean. The communication with Joaquin was excellent and he always responded very quickly to any question I had.
Definitely recommended!