Paradise Rot

Dreamy, weird and held my attention.
Jo has arrived in a foreign (very English-sounding) country to attend school. She ends up rooming with a Carrol, in an old brewery that has sort of been turned into an apartment house. They used particle board to separate the rooms (and it doesn't go all the way to the ceiling). Not sound-proof at all. There is a neighbor I'm not sure actually existed.
Either the women start experiencing some sort of magical transformation (the brewery is becoming a garden) OR they are having shared delusions. Either way, I had no idea what was going to happen next and read this in one sitting.