We were in 3 and we enjoyed very much the super convenient location and the easy check-in and check-out (very smart the entrance through an online link, so that each of us could come and go at any time without bothering for keys).
The apartment was big enough, with 5 beds (6 people in total) and 2 bathrooms (with 2 showers).
Highly recommended if you are looking for a comfortable place in Barcelona and you are more than 2.