If you want to book a hotel in Havana you have very few good options if not only two right now that have decent service.

Hotel Santa Isabel in Havana Vieja

Hotel Saratoga in Centro Habana.

Both are around 400 cuc a night, and have great rooms, but if you want a good room at a decent price, sometimes a whole apartment, I would say you can already check Airbnb from US or check other websites to rent rooms or "casas" as Cubans know them.

You can get amazing offers right now.