Karla is a very communicative host and many of the bumps weren't her fault but she was very responsive and is a great host. At one point the building had no water for several days (as sometimes happens in Mexico, no biggie, and Karla refunded those nights or offered to pay for a hotel so I could shower, etc.) I was very impressed by her willingness to problem-solve!
That being said, I did encounter a few things other people staying here might want to know. First is that there's a long-term construction project happening directly next door, so noise will likely be an issue. The apartment is on a terrace level with two other apartments, and the only windows look out directly onto that terrace, meaning that with the shades open there's not much in the way of privacy. There's also a restaurant on the ground floor that runs a wood oven and the chimney is on the roof, so with the windows open smoke can enter the apartment. I also found that during the day the place gets quite warm (including the walls themselves, which get hot to the touch). I also encountered a consistent strange stench.
I wouldn't say it's a bad place to stay at all—the kitchen, location, host, cleaning service is all great—but there might be better valued places, and it's not without its flaws.