I am going to tell you about the Hop on Hop off Bus Tours Barcelona. Below are some Points.

Explore the city according to the spare time you have with the Barcelona Hop-on, Hop-off Bus Tour
The Free APP “Sightseeing Experience” gives the real-time position of buses and waiting time at every stop.
The Walking Tour includes English, Italian, French, Spanish and German.

Visit : https://www.hop-on-hop-off-bus-tours.com/tour-barcelona-city-tour-hop-on-hop-off-bus-tour