I spent 3 nights in Havana at a guest house. Private tours were arranged for me on the two full days I spent.
Some of the things we visited included rum and cigar tasting, the Museum of the Revolution, the Floridita, a restaurant for lunch, local artisans and monuments, and shops. I also had a private tour in an old convertible car as well as a private taxi to the Santa Maria beach.
Additionally, airport transfers and breakfast were included.
During my free time, I got a taxi and explored a few more areas on my own.
This was the perfect amount of time to see Havana.