If you want to explore Valletta it is better to go walking and good shoes are a must.
Valletta is best to be explored on foot because driving a car or riding a bicycle up and down the stairs tends to get a bit uncomfortable
The lovely ancient streets can be very steep, and some of them are only steps,like this one.
Therefore, if you love hilly streets and climbing stairs up and down and this way and that way Valletta is a must! Walk, walk, clinb,climb...