Plaça de Catalunya
The Plaça de Catalunya (Plaza de Cataluña in Spanish) is a large public square in central Barcelona. It's considered to be the central point of the Catalan capital, where many roads (including La Rambla) start.
There's great shopping in the area, and plentiful transport options, with taxis, tour bus, metro and public bus routes all plentiful.
Plaça de Catalunya is regarded as the central point of Barcelona city centre, where all roads, and most good tours, start.
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in Madrid it was wonderful experience.
being able to hop on and off also allows flexibility rather than having to stay on for a whole tour loop