I went to Casa Lucilo y Nirma for 4 days in 2011 and I decided to go back for longer this month. I just got back and I had the best time ever in all my 11 times in Cuba, the whole family is very warm and friendly and they make you feel at home. Even their friends who pop by are awesome. And the town of Viñales is full of friendly people, not like Havana where there is a hustler every ten steps. I would definitely go back.
They know everything about Viñales and can certainly help you figure out what to do every day. People say 3 days is enough but I disagree, especially if you are a nature lover. I'll definitely go back.
And like everyone says, the food is very good and very healthy.More