We had a great time staying at Juan's place. We had some concerns about the location when we booked, but the neighborhood was very safe and convenient. The metro stops were not far and we were a walking distance from the museums.
The apartment itself was very clean and had everything we needed as travelers. They were also really accommodating about check-in when we were in the city early, and he responds very quickly to messages.
Lastly, they were really inviting and friendly. One night, they asked if we wanted to have some treats they had gotten from a wedding and shared drinks with us. All in all, a great airbnb.