I stayed 3 nights at Christian's place.
Pro's: Christian is a great host, super easy check-in experience, helped me resolve a few minor issues I had quickly and efficiently. Also, the apartment is very spacey and well lit, and is located relatively close to Condesa / Roma neighborhoods.
Con's: The apartment is noisy throughout the day and night, as it is located on a main road. Noise isolation isn't good. The WiFi is fast but was a bit spotty from time to time. Not a big deal.
Overall - if noise doesn't disturb you/ you're OK with earplugs, you're probably going to love Christian's place.