As others have stated, the apartment is super convenient to tons of shops, grocery stores, and the metro - perfect for travelers. The apartment stairs... are there a lot? Yes. Are they as challenging as ascending to Parque Guell? No. Will you have amazing butt and calve muscles after climbing up and down them a few times? Perhaps.
Upon arrival, we noticed that there was minimal water pressure. We contacted Eva and, within a couple of hours, she was on site a plumber, who fixed the issue. As others have mentioned, the only AC unit in the apartment is in the living room; however, there are 2 floor fans that offer relief in the 2 bedrooms on especially hot days. We made use of the washing machine, which Eva was thoughtful enough to leave detailed instructions for use.
This is a perfect base for able-bodied adventurerers who need a home base for exploring Barcelona. Be prepared to get a bit of a workout when coming and going, enjoy the feeling of a vibrant neighborhood, and have a great time in Barcelona!