Princesa de la Luna is a true unique experience. If you're looking for a luxurious resort you should look elsewhere. However, if you're looking for a unique and authentic Costa Rica experience this is perfect. The location is absolutely beautiful. I recommend taking a walk in the morning and taking in nature's beauty.
The house is truly amazing. The architecture is unique and almost one with nature. The common areas are open so you have an amazing view anywhere you go. There are plenty of sitting areas to relax and Jonathan (the owner) is incredibly helpful and can help book any activities you might be interested in. Something to be aware of is that the house is a little off the beaten path so it's difficult to find at night, I recommend trying to check-in during the day time. Also, if you're driving keep in mind you need to drive on a dirt road uphill so SUVs might be better. Another thing to keep in mind is that because you are in the middle of nature and the house is open you will see insects, bugs, lizards, etc but it's part of the whole experience.