We had a very nice stay at the airbnb! The location is great, super close to the beach. Barceloneta is definitely a great place to stay since you have the beach close to you as well as lots of cafes and restaurants and you can quickly go to any attractions and other parts of the city (great connection with the metro). The hosts are nice and responsive and the apartment is well equipped with the things you need.
It is a small compact apartment that has everything needed also for a 1 month stay.
Some things that can be improved: You do need to be aware that once you arrive you need to pay an extra tourist tax. Before arrival I double checked if all costs are included (e.g. tax) and received a confirmation but once we arrived we still needed to pay the tourist tax. The dishes were not super clean; the bed sheets are too small for the bed so sometimes you lay there without, there is little space to dry the towels. However you can see that the hosts take the feedback into consideration and improve the apartment!