There were definitely some positives - the location is great, the metro station is close by and everything is reachable by foot. The apartment is somewhat quiet if you keep your windows closed. The host responded to our questions/complaints fast. The terrace is a really nice addition to the apartment. The wifi is fast enough to work remotely. There are also a few good restaurants nearby!
And now the bad part, the apartment is infested with cockroaches (big ones), our friend found one crawling on her leg in the middle of the night. Sleeping in the apartment became an issue after that, to be honest. The host tried sending someone to the apartment to put some pest poison but that clearly didn't help at all as the cockroaches were back the next day.
2 out of 4 chairs on the terrace were broken up to a point where sitting on them was impossible.
The toilet does not have a lock which is inconvenient when there are more than 2 people staying.
The apartment is also older than it looks in the pictures - but you can kind of expect that in Barcelona.
All in all, if you don't consider the cockroaches - not a bad stay, but this, unfortunately, ruined our experience.