The apartment was ok and big. We were a group of six people, but 9 people would have had also more than enough space. The location was great, the check in really easy, using a digital key. The problem was that we had No heating, and it was kind of cold especially during nights (we visited BCN in November)
The apartment has problems with the noise, you can hear everything from your neighbors, but you can stay having a glass of wine in the living room (our neighbor an old and nice lady came to ask us kindly not to make noise in 2 rooms - which were near her walls). But do not worry - you can stay with your friends in the living room