Mariona is a wonderful host! My family and I arrived on Mother's Day and she brought me cookies to celebrate which was so sweet. She was very helpful in getting us oriented to the city and offering suggestions for places to eat, etc.
The apartment is just as the pictures show. It is indeed charming and central. It was also very clean and well stocked. The location is excellent, close to the metro and walking distance to most sites. It is located on a busy street so it is a bit noisy. It did not bother us but if you are sensitive to noise you might bring ear plugs for sleeping.
We would definitely stay here again if we came back to Barcelona and highly recommend Mariona and this apartment.