Pros: Perfect location to take advantage of what's so wonderful about Barcelona. This place is located in the best neighborhood in Barcelona, far from the annoying touristy areas. Cute little bars and cafes serving stellar food, beautiful streets and plazas are all within a five minute walk. The apartment is located in a lovely residential building on a street with almost no traffic. There is a full kitchen. There are also a lot of beds in this place, which gives you flexible sleeping options (see cons). The host is very nice and communicates well.
Cons: You will need to experiment a bit with finding a place in the apartment where you can sleep comfortably. Some beds are extremely creaky. The shades don't block the light at all. There were noises from building renovation starting at 8am and going through the day. There were also various noises throughout the night from surrounding apartments. These might have been renovation or construction-related. This might be temporary so we might have just not stayed here in a good week. The street is very quiet and has almost no traffic, so surprisingly the most comfortable place to sleep is out on the futon mattress on the room adjacent the road.