I had a good time in Barcelona and the flat was nice. Finding the office the first day was so difficult and I was walking up and down the street trying to find it. After about 30 minutes I was able to (it's caddy corner to the address location on a map). When I tried to call the office to ask for directions there was no answer even though it's a 24h office.
The flat itself was much smaller than expected, but it was fine for a few nights. Although it was a bit difficult to share a bathroom with 7 people. The power kept going out because of a faulty button in the fuse box. It was easy enough to fix but kind of a hassle. The building also smelled really strange and kind of unpleasant. The staff at the AB office were really nice and helpful with directions to the flat and checkin/checkout. Overall, good stay.