The flat is right under the roof, but there is an elevator, although that one is tiny.
The AC is working fast and silent, the apartment was just as expected, needed and like on the photos. We only couldn't find any info where to leave the trash, so we left it in the flat in a plastic bag and the trash bin. Everything is there that you need for a few days in Barcelona. It was maybe 10 min walk to the next train station, very easy to find!