The apartment is functional and pretty conveniently located. It's on a traffic-heavy block that's low on charm, but is very close to nice parts of El Raval and directly across from the wonderful maritime museum. Nuria's (very friendly) brother met us promptly at check-in time. The apartment is up on the 7th floor and has a friendly doorman (except on Sundays). The A/C was essential on our June visit, and it was great to have a washing machine, though it smells strongly of mildew.
I personally wouldn't recommend the apartment for more than four people, although technically it can sleep more. The spaces are pretty small. At this point, too, it would benefit from a refresh--it's pretty dinged up and scuffed up. There was a leak under the kitchen sink that we weren't told about and discovered on Day 4 when the plastic tub that was catching it overfilled and spilled onto the kitchen floor. That explained the mold smell in the kitchen. We arrived to a powerful fishy smell in the fridge as well.
Of the four beds, only three were made up with top sheets and only two with any blanket at all. I eventually found a spare mattress cover in the closet to use as a kind of blanket. Just FYI if you expect such things, we were not left with shampoo or laundry detergent, and were provided only enough TP for a couple of days (for a 5-night stay). There's a market around the corner where you can pick up essentials like that.