We enjoyed our stay at Maria's apartment. Note that the apartment is on the 3rd (US 4th) floor but there is an elevator. We did our best to walk the stairs especially going down, but at the end of a long day or with luggage the elevator was a saving grace.
The apartment itself was comfortable and had plenty of space for me, my husband and our grown daughter. She indicated that the bedroom she was in - towards the entrance -was a bit loud the first night from people using the elevator. There are large windows in that bedroom that face the center of the building where the elevator is located. She either got used to it or it wasn't used as much the rest of the week. Beds were comfortable, plenty of towels and dishes, etc. although we didn't cook in the apartment.
The location was very good for us. There are a couple of grocery stores a few blocks away (Keisey and Lidl) and convenience stores even closer. There is a Granier a couple of doors down for croissants, pastries or small sandwiches. There are a few local restaurants close by. We enjoyed stopping into La Neura for a drink and tapas - seems to be a lot of locals. Also several places on Pg. de Sant Joan. We liked Chicalimona.
The apartment is right across the street from Verdaguer metro stop so we found it easy to around. It's also a short walk to La Sagrada Familia. It was nice to walk over to see it all lit up at night.