The flat is in a perfect spot. It could no be better. You have all activities and meetings close by, the metro and supermarkets. And it is still not so touristic.
All is nice and I can recommend the flat. Breakfast was not included. There is only one bathroom for the guests.
For the check it better call Karla two or one hour before arrival to make sure she is there.
You will definitely enjoy your stay in Barcelona if you stay here, it will get hard to find a better and cheaper option.