The apartment was located in a noisy but fun neighbourhood, it had easy access to metro line L1 and L9 (so great connection with BCN airport) as they were just a few minutes walk from there. Communication with the host was also easy, he responded to our email really quickly.
The room itself was small but comfortable, it was pretty clean.
The only problem we had was that there were no windows, only a glass door with a really small area we didn't even have access to, so air circulation was a problem in the flat.
Overall it is a cheap stay for those who want to spend most of their time exploring the city, we had a great time in Barcelona.