I stayed 4 months and a half and the location was perfect. Very central, and quiet with all commodities at walking distance (Parc de la Ciutadella, supermarket, Arc of triumph metro station, the sea, the city center, etc)
Very good and fast wifi. The room is small but comfortable and clean, like the rest of the flat. Cassie makes sure to clean the communal parts every week.
During my all stay, Cassie has been very helpful and reactive. To me, she's a super host and I'll definitely come back. My only wish would have been a more cozy lounge or common area.
I strongly recommend it.