I completely agree with the other enthusiastic recommendations for Luna Llena and there's very little I can add. I stayed in the shared dorm for three nights, $10 per night. The hostel felt like a home away from home. It was so comfortable and cozy, with really great decor and an absolutely unbeatable view. I woke up to howler monkeys each morning and watched the full moon rise during my stay. The Thursday night barbeque was such a fun and unique event - it really shows what a social and welcoming place Luna Llena is. Milly and the rest of the staff were so warm and helpful, I felt completely at ease.
After backpacking through Costa Rica and staying in many, many shared dorms, I can say without hesitation that Luna Llena is absolutely the best. Muchas gracias Milly y todos!
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.