The 500-room, TSH Campus Barcelona Marina is a dorm-turned-hotel, and doesn't pretend to be anything else. Rooms are tiny, but bright and clean, with private bathrooms. There are common cooking facilities on each floor with refrigerators that have lockable compartments for each room. Children are not allowed, but the clientele is young. The location is good for tourists and students, with two metro stations nearby, and views of the Sagrada Familia from the roof decks -- which also have lovely pools.