We stayed at Lewis's place for 4 days and had a good time in Crystal Palace. The appartment was amazingly clean and tidy :-)
The room was very nice and quiet, the bed was super confortable, with a nice view on the garden. The kitchen was functional.
Also Lewis was super friendly and helpful!
Unfortunately, the shower was not great as the water was not reliable (it went from very cold to boiling hot without warning), but there is not much the host can do about that.
Location is 10 min walk from the "triangle" (the street with bars and restaurants), and next to the park and bus stop, in a good neighbourhood. We would definitely recommend it.