This is a lovely property with wonderful views of the Arenal volcano. The staff, especially, Reyner, was very helpful. The pool is lovely as are the grounds.
Our room, a junior suite, had a nice patio overlooking the garden with the volcano in the background. The furniture is a little "tired" but the room had nice amenities-refrigerator, microwave, and safe.
Happy hour-poolside-4 PM to 5 PM was very nice.
Cons: a $15 to $20 taxi ride to town. No restaurants within walking distance with the exception of the on-site restaurant.
Food-on-site restaurant-breakfast was OK. We had a very mediocre dinner-billed as a chef special-3 types of beef that were flambeed with a variety of local veggies. The meat was very tough and not flavorful.

They badger you to sign up for tours. When you want to just do something on your own (and not pay $200 to walk through the forest) they pretend like you are crazy and don't know where any trails are.

They took away our de-humidifier then pretended not to know what we were talking about when we wanted it put back in the room.

About the only good thing was the breakfast.

Lets start with them room, simple and clean but the shower doors were not working at all and one of room walls had a hole. The hotel looked old and in a need for a serious renewal. The food and drinks are really expensive and they weren't so great. Now the thermal waters..... 3 small pools and for my taste they were not hot thermal waters...they were like warm pools, the jacuzzi at the spa was even better. The Spa is super expensive....

If you want to experience the Volcano views and hot thermal waters this is not the place for you.

My partner and I checked into the MDF a few nights ago for what I hoped would be the crowning jewel on a week in Costa Rica with mixed experiences (including a night at the Dunn Inn c/o T.A. in San Jose 5/10). To sum it up the rooms do stink of cheap air freshener, and not just lightly- annoyingly. The windows don't open so airing out the rooms consists of opening front and back doors hoping for a breeze. The bathrooms read 1971 and have no hot water. The staff do their best to provide a pleasant experience but lack the ability to recognize or facilitate the need for some simple improvements. The restaurant on site has the worst lighting ever experienced by this traveler and the food matches the ambiance- asz bad. The "asado" special was recommended by the waiter and although requested med. rare came as well done and rubbery and flavourless as could be. I could go on but I'll save you the time- PLEASE DON'T EAT THERE- My gf did not appreciate the dead cockroach in the salon...well it is CR after all