Aline & Alba's apartment is a good option if you are looking for something relatively central, affordable, and need a reliable place to stay while you spend most of your day exploring Barcelona. The space was clean, it had all the basics, and it's situated in a great neighborhood and location. Check-in was pretty simple, and the host company was pretty responsive to any questions I had.
I was spending a couple days in Barcelona working remotely, and hoping to use my Airbnb as a work space, so unfortunately the setup wasn't ideal for me. The internet was relatively weak, so I wasn't able to do anything that required high-speed internet (e.g. video calls), and the space was darker than what I was expecting, based on the photos. In addition, there are ceiling fans but no air conditioning, so it was a bit stuffy.
Overall, I would say this is a good space if you simply need a place to crash while you explore the city, but not a good space if you have many needs beyond that.