Very good apartment, well situated in a very nice neighborhood, clean. It is on the second floor if a building and has a nice, large private terrace. Fit for a couple or a single traveller.
However, the wall soundproofing is poor and the neighbors conversations are very audible. I don’t think the neighbors are loud or rude, rather it seems it’s a real construction flaw of the building. Thus, if you plan to visit Barcelona and mostly just sleep at the apartment, it’s perfectly fine, you can have a good night’s sleep - there is no noise at night.
On the other hand, if you plan to spend some time during the day at the apartment (for example working remotely on Zoom), at times it can be challenging.