We really enjoyed our group stay at Barbara's apartment and would definitely recommend it to other groups of 4-6 people looking for comfortable and central/easily accessible accommodation in Barcelona.
The communication with Barbara before we arrived in Barcelona was clear and she met us at the apartment building and gave us a tour of the property and talked us through admin/logistics. As above the location is in a central but quiet, residential area very close to Sant Pau metro station (3-4 minute walk) and a 13-minute walk to Sagrada Familia. There is a small 24-hour shop about 2 mins from the apartment which was handy.
The four bedrooms were not particularly big but were clean and the bedding very comfortable. There are two double rooms and one twin room. The two bathrooms contained plenty of clean towels and the two showers worked without any issues. The living room is spacious with a retro/classic style kitchen which contained all the utensils required (and also a dishwasher). It has a small balcony where we ate breakfast and relaxed on late in the evenings.