Breakfast is almost never included in the price. It usually costs an additional 3 to 5 cuc per person, per day. Honestly, this service is very convenient, and the breakfasts are usually very large and good. But at the same time, there are many local restaurants in Havana, and you can get a good breakfast sandwich with juice and coffee for about 1cuc per person. It really depends on your choice. When you arrive in Havana you can simply tell the host that you want breakfast, and it will be prepared for you. Most casas also offer meal services throughout the day. These are more expensive. The meals are typically really good. I recommend you try them at least once, just to get a taste of homemade, authentic Cuban food.