Here's what was good: easy check-in, good central location for walking around the city, apartment was clean, it had a washing machine.
Even so, I wouldn't book this place again if I return to Barcelona because it was just mediocre. It is what you would expect at a mid-range hotel. The kitchen lacked basic supplies like scissors and dishtowel to dry your hands after washing them. I suspect the whole apartment building belongs to the same owners, and it's just an investment business, each unit furnished with just barely enough IKEA furniture to get the job done. The living room could use a rug, and the whole place could use some character and comfortable touches. In sum, it's basically like staying at a clean, simple 3 star hotel (but without the daily maid service). It'll do the job.