After some major hiccups during the Check-in process (including receiving the wrong keys after waiting for 2 hours, resulting in having full and unsupervised access to an already booked Airbnb), we finally got into our apartment. Unfortunately, I cannot review the Airbnb pictured above since both offered alternatives deviated from the available photos.
Our hosts partially reimbursed us with half a night’s charge, but this didn’t really help improving the experience - very unfortunate, since we really just wanted to relax at our last two days in Barcelona.