Going to Cuba sounds great but we also have to think about a lot of things. Including (if not most important) our health!
I found a very useful website created and supported by NHS where you can read about all current illnesses found in the country you are travelling to. According to this, Cuba currently have few of the popular disease like Hep A and Hep B.
Not that others are not important, but for us the most dangerous one is Malaria because it’s something you can’t really do a lot to avoid.