Great value for money, loved the Eco tour around the island.
During the winter months the buses come every 30 minutes whis is a long time to stand in the cold if you just miss a bus and in some instances we waited for more than half an hour. A lot of time is wasted waiting for buses and traveling to a destination where the metro would be much quicker. On some sectors the sound system was not great and difficult to hear the commentary. I would recommend getting a one day pass and do all the loops to orientate to the city, without leaving the bus more than once or twice and then use the metro to travel to preferred sights on following days.