Camino Verde is the best. After booking for four nights, we ended up staying a whole week, and then after an escapade to Panama, we made a point of coming back for our last week.
Let me repeat that... we crossed all of Costa Rica, to go back to Monteverde, just so we could stay there again.
We loved Jose and Andres, the manager and owner, and the general atmosphere of the place. It's calm and cozy, and everyone is really really friendly. You MUST go hear.
Also, the breakfast is absolutely delicious, it's unreal!