We had a great extended weekend in this apartment. There was enough space for our 1 year old to play, a baby bed and a baby chair. The main bed was very comfortable (although a bit small).
Location is perfect: within 20 minutes by subway to the old center, but also to Sagrada familia, supermarkets were very close by, and even restaurants (which we didn't try).
Max was very helpful with the check in, especially getting up the narrow stairs with the stroller, but also with navigating the apartment and the surroundings! We heard it was his first check-in, that was not noticeable!
The apartment itself was very clean and having all the necessary utensils to cook a small dinner. When we come back to Barcelona we would definitely return to stay here!