This flat is a studio apartment and really nicely designed. 3 of us stayed here comfortably. The bathroom has a frosted but not opaque glass door so make sure you're comfortable with the people you're staying with!
The flat is located really centrally overlooking a really nice square. It's about ten minutes walk from plaza Catalunya or ten minutes the other way to the beach which is really handy.
The location is also its downside, the central location means it's really noisy at night, particularly on a weekend. We stayed over Sunday night and it was very loud. Monday and Tuesday nights were a bit better.
So - great flat, great location. Easy check in and out. If you're a light or early sleeper then this isn't for you.