This apartment is in a fantastic location! One block from Universtat metro station, and a short walk from Placa de Catalunya with even more transit connections. It's positioned perfectly between the Gothic Quarter and Eixample, with tons of restaurants, shopping and nightlife.
The apartment is big and bright and airy, which is great for a large group. The kitchen is spacious, and there's plenty of seating for both relaxation and dining (or in our case, working as a group). The bedrooms are all big enough to accommodate 2 people per room and there's ample closet space. The building lobby is beautiful and well secured. There's a lift, but it's quite small — but at least there's a lift!
The only real downside to the apartment is the bathrooms, which isn't all that uncommon for these old buildings. Thankfully there are 3 bathrooms, which is great! But there's only 1 shower, and it's in the master bedroom, which is really limiting for a large group that all wants to get ready in the morning.
Outside of that, I'll recommend that you make a trip to the supermarket on your first day to get a bunch of "essential" items for the apartment didn't have when we stayed. There was not much toilet paper stocked (most large apartments we've stayed in have this included), and limited soap/shampoo. There was also zero cleaning materials available (cleaner, dishsoap, towels, sponges), so in order to clean and do dishes, we had to buy these items ourselves.
The host provided a towel service half way through our visit, which was great. But having enough of these essential items stocked and available would've made this stay fantastic and a little less stressful considering the fact that if you're renting a space this large you're likely traveling with a large group.