Havana is a great city for relax walk through 1960's. Time is almost standing still for 60 years now, the only thing that will give you the feel of present day are young people with smartphones in their hands and earphones in their ears.
Cuban mojito is great and people are lazy, at least they are lazy in tourist areas.
Anyone interested in seeing how Cuba looks today, before all the Americans come, should book their Cuba vacation today.