Diego place is great! Very close to the metro and many shops, restaurants, and super market! The apartment is a 2 min walk to the metro and 3 stops away from Sol (a huge touristy place!)
It was super easy to communicate with Diego! We never got to meet him because he was away on a business trip, however, his girlfriend gave us a ride to and from the airport for a cheaper flat rate price (cheaper than taxi!) and she too was super friendly and helpful! They are both great people and I will definitely stay again whenever I'm in town!