I stayed here for 3 nights as part of a group of 4. The apartment is as advertised in the pictures. It's clean, well-maintained, and quite spacious. The beds are comfortable, the bathrooms are in great condition, and the AC seems to work well. However, it wasn't too hot during our stay so I'm not sure how it is during the summer months. One thing to keep in mind is the apartment is on the 5th floor and the elevator can hold 2-3 people. My group only had backpacks so it wasn't a big deal for us but if you have a lot of luggage, it could be annoying.
The location is great. It's very close to a lot of late night bars and tapas restaurants. Public transportation is close by and it's easily within waking distance to La Rambla, the Gothic Quarter, and even Barceloneta.
Enrique was an excellent host. He reached out to us well before our stay to make sure check-in would be smooth and easy. While he wasn't able to meet with us upon arrival, a local colleague met with us in person to hand us the keys and show us the apartment. There was also a basket of snacks, water, and wine ready for our arrival. Enqrique responded very quickly to our messages and made sure we had everything we needed. I would highly recommend this place for groups of 4 to 6!