I've lived in Costa Rica for a while now and I can easily tell you that Mantras is the best food there is to be found. The crazy thing is it's Vegetarian, but you wouldn't know it, the food is just so good you don't even notice that it's Vegetarian.
I read the review a few spots below and couldn't disagree more, the service was amazing (I mean the place gets busy as heck during peak hours, but the staff is still super good, never forget anything and the kitchen turns out meals so quickly for such great quality). I love the look of it too, the garden is gorgeous with the new bamboo. Honestly, everything is just of the highest quality, but the prices are great too.
The smoothies are the BOMB, definitely recommend them and the daily specials are so danged original, I had wraps and man was it ever good. It's strange that I can eat something so healthy and yet feel so full. The owners are great, the service is great, the atmosphere is fun, the prices are so reasonable and the food is unique and delicious. Honestly, what more could you ask for? Mantras, in my opinion, is the best restaurant in Costa Rica and I would recommend it to everyone living here or visiting here.