Cristina's place is really in the most ideal location - right in the center of things, but still in a quiet courtyard. The room and bathroom were very clean, and though the bed was a sofa bed and only moderately comfortable, the bedding was wonderfully warm and comfy in the unseasonably cold weather Milan was experiencing.
Cristina was very helpful, answering my questions and giving me suggestions on where to eat in the neighborhood. And she also gave me herbal tea, because I was getting over a cold. <3
The only real downside was that the neighbors on the other side of the wall apparently just had a baby, and I had to use earplugs to get any sleep. So if you're a light sleeper like I am, maybe wait till the kid's a bit older before booking, or bring good earplugs!