Hubby and I spent 2 nights here on our honeymoon. Definitely paradise! The views of Arenal are simply amazing and we were there during the green season!
We were in villa 400 which had an indoor jacuzzi and then an outdoor plunge pool. Bed was comfy, room was clean and the bathroom was spectacular. I did jump out of my skin though when in a midnight bathroom trip a frog jumped in front of me...he was living in our waterfall shower. No big deal :).
Food from the restaurant was good, nothing amazing. Pricy for costa rica but normal for home prices. Made friends with the waiters who were happy to help me practice my terrible Spanish (muchas gracias).
Swim up bar was the best. Armando makes good drinks and invites you to bring ur iPod /iPhone and then you take turns playing songs. Spent a good few hours just relaxing and talking. Loved it.
If you're going to La Fortuna/Arenal - seriously consider this place!