I stayed for 100 days in Jirka's flat together with a friend. (from 15 sep 2021 until 23 dec 2021) We were foreign students. The neighbourhood is very good, it is wonderful to be able to see the sea every day. 20 steps and you are on the beach. You can walk to the city or take the metro, the metro station is not far from the flat. We did not experience much noise in the building. Monica was always available if we had any problems or questions. She is a very kind and helpful woman. We never had problems with the internet connection, the wifi works very fast, you can just scan a qr-code with your mobile and you are connected. There is a dishwasher, washing machine and vacuum cleaner. There is enough cutlery/kitchenware. There is a large dressing room and because we brought a lot of clothes for our long stay, we had bought some extra coat racks/ hangers, so there is plenty of room for your clothes.
In the evening the neighbourhood is a bit less crowded than during the day but you don't have to be afraid, there are many local people living in the neighbourhood and we never experienced anything strange. There are 2 bakeries at only 50-100 m, a butcher at 100 m and the supermarkets Lidl and Spar are also very close. Don't forget that most supermarkets in Barcelona close on Sundays, but you can go to the smaller local shops that are open, in the street: carrer de la Maquinista. In this street you will also find the Lidl.
From the flat, you can walk to Placa Catalunya, Placa Reial, Parc de la Ciutadella, Passeig de Gracia, El Born...
For the metro in Barceloneta, just take line L4 and you can reach all the best places easily. If you are on holiday take a 10 turn card. If you are a foreign student or someone who wants to do an internship there, then it is best to take a longer subscription/abonnement, for example for 90 days or more.