Overall, great apartment and experience. I give this 5 stars, but there are a few things to consider.
Responsive, nice host with positive energy (Luis). Great location as it's both secure and convenient to the best bars, restaurants, etc. (also a gym and currency exchange are a block away). Loft is spacious, clean, and has lots of natural light and patio space. There are two clean, functioning bathrooms. While one is nice, the other is a pretty worn.
The loft is on a very active cobblestone street and the walls are thin. You will hear garbage trucks and buses all night and it'll shake the entire loft. However, this is outside the host's control and is common when an apartment faces a street (in this city).