Excellent stay at Marians place. I have been staying there for a month-long trip with two colleagues.
Inside the apartment
The apartment looks quite structured. It is small in some rooms but it works. It has all necessary things for a long-term stay. Basic cleaning service was included once per week which was great and Marian was really responsive if we had any question.
Work
The Airbnb is perfect to work from. We commuted to an office in Passeig de Gracia or El Poblenou and public transportation got us there quite quickly. For the times we have worked from home, the internet was super stable and fast. The furniture provided in the apartment was also really great to work from home on certain days.
Area of the apartment
The big plus of the apartment is the area where it is located. Some really good restaurants are around in the area (Bar Calders, Takearte, ...). The area is kind of local, so it won't be so touristy which is quite great. If you want to go into the touristy areas, then those will be just a metro-ride away.
We have visited beaches many times during our stay. Castelldefels is only one hour away by a bus ride without changing the line and Barceloneta and other city beaches are reachable via another bus without changing. Super comfortable to go for an evening on the beach after work.
Time of our visit
We have visited during September/October. The weather was quite warm in the beginning with reaching 30 degrees easily but it got colder during our month-long stay. It was honestly the perfect weather to be in Barcelona.
Overall, we have really enjoyed the stay in Marians apartment. Its perfect for remote working/studying for a longer time with a group of people.