Christophe's place is very well designed and centrally located in the heart of Alfama. It is a studio apartment so it is pretty small, providing only the essentials. I stayed there with two of my other girlfriends and it was a tight but comfortable fit for us. Note this is a third floor walk-up and the stairs are pretty steep. I liked staying in the area as there is easy access to restaurants and look out points. Additionally it is only a 15-20 min walk into the city center of Lisbon. However Alfama is an older area so although the apartment is very modern looking, there is no AC. My friends and I were fine at night as it can be cooler with the windows open. Note that noise travels very easily as the streets in this area are very narrow and many tours and people pass through so I would not stay here if you are a light sleeper.
Christophe was a great host. He was available and responsive during our stay and check-in and check-out were very simple and straightforward.