My daughter and I stayed 4 nights in the Ramblas B apartment. It was incredibly convenient, as we could quickly and easily return to the apartment to fill our water bottles, use the bathroom, get a sweater, etc. The apartment is entered right on the Ramblas, 1 block from Placa Catalyuna, but is quiet because it faces the back of the building and is on the 6th floor (there is a charming, ancient lift). It is perfect for 2 people, but I think would be tight for 3 people, even though there is a sofabed in the living room. The beds were comfortable, the towels and bedding were nice, and everything worked, including the washer, which was great to have after 2 weeks of travel. If I return to Barcelona, I would definitely stay here again. It was very convenient and pleasant.