Two best friends stayed in this apartment and was so excited to have booked this listing. This is a gorgeous apartment with lots of space. One slept on the bed and the other on the couch and never felt uncomfortable. I would probably not suggest for four people to share this apartment since two would have to sleep on the couch but it is doable.
The apartment is in an almost residential area with lots of restaurants, bars, and corner markets. The metro is about five blocks away so you will have to walk to that location which take about 7-10 min.
We were not able to meet Laia but she was very accessible through messages and the airbnb app.
Overall if you are staying in Barcelona I would recommend this apartment for your stay.