We stayed a week at Silvia's apartment, 2 couples, and it was great. The apartment has all basic and needed utilities and very good sunlight. Super good location in Poble-sec (not in the city center, but close); close to the sea, several supermarkets, cafes and restaurants around and great public transports opportunities. We did not meet Silvia, but we met Alberto for the check in, who kindly told us a bit about the area and history of Barcelona and gave recommendations for good local dinning.
Thank you Silvia and Alberto :)