Three things I care most about: location, safety, cleanliness (I have extremely sensitive dust allergies).
Ernesto's place was a great location and safe. Gates and doors and the stairway feel very safe. Neighborhood is good as well.
Clean with a lot of storage. Even if a home is clean, if there is a lot of stuff/furniture/items/equipment, dust will naturally occur. I would mark this place as very clean and a moderate amount of things.
One thing that was very surprising is that the place is on a fairly loud street, esp. weekend nights, but the windows do a great job at blocking out most of the noise.
I have some small nits but no major red flags. All in all had a very pleasant stay. I would be open to staying again.