This apartment is absolutely fantastic! I stayed here for a month and simply didn't want to leave.
The location is perfect. It's essentially on the border of El Gotico, El Born, and Barceloneta. It's within walking distance of the beach, Las Ramblas, Placa de Catalunya, and (if you're active like me) Placa d'Espanya. The metro station is close as is a bus stop with a bus that takes you to, among other important places, Camp Nou. It's also within walking distance of literally hundreds of bars, restaurants, and bakeries. The neighborhood is safe, and, if you're a runner, you'll be able to run along the beach within a mile of leaving the front door.
The apartment itself is clean and comfortable. The wifi is solid. The TV also has a radio option, which is nice if you just want some background noise. The washing machine, stove, and dishwasher work without any problems. There is also an oven, but I never used it.
Marcella is amazing! She worked with me on check-in which made it easy and seamless, and she was flexible with check-out. She was very responsive with any questions that I had.
This apartment truly gives you the "living in Barcelona" experience. I love it so much that I wanted to stay here when I return next month, but it's already booked. So, do yourself a favor and rent this apartment while it's still available!