This apartment was adorable and perfect for my friend and I, but has more than enough room for 2 more people. There are a lot of shops and restaurants within walking distance which made it very easy to find great food. It is also very close to the metro which was the best way to get around and I highly recommend getting a couple day pass if you are there for the weekend.
Things to note: there is not a direct elevator way to get to the elevator, you need to walk up stairs to get to the elevator. Also there is a mysterious smell in the halls of the apartment complex but that you can get over.
Overall, had a great time and would come back if I stayed in Barcelona again!