You can visit the city comfortably on foot in two days. I do not really agree with the alarms about petty crime (perhaps obligatory), it can also be easily transported by bus and metro at very low prices, it is very clean and with a little English. he arranges well.
Being in this square to do the 360º panorama to see the edified is anything. Stop and feel the environment - watch the people and stay until the dusk. Magic!
And live the legends of Prague: it's really worth it! You'll do aldo in the Baroque era, look up and see the facades of buildings, everything is within walking distance so take it easy and enjoy the atmosphere!
let yourself be bewitched by the music of the vendors, the carriages and the perfumes of the stalls, the step in the pasasto is assured above all and go sunset!