Recently stayed in foz De Iguacu over xmas it was fantastic the service the rooms and the food are great ,i recomend to anyone going to Foz.
The waterfall is one site worth visiting and better seen on the Brazil side as you can see more because there are more falls in Argentina.

Excellent location, 5 mins from Foz de Iguacu, 15 minutes from the airport and 20 minutes from the falls. Very clean and well maintained - the rooms were sparkling clean, as were the pools and all the public areas.

The pools were a bit on the small side (coudn't actually swim much), but this was made up for by the lovely temperature which allowed swimming day and night. The pools are fed by a thermal spring, and offer different temperatures of pool as the water flows down from one to the other. The constant replacement of the water (every 4 hours) means there is barely any chlorine and it is lovely for lounging around in.

Big buffet breakfast included in the price, with amazing fresh fruit. Food and alcohol was reasonably priced generally, though the buffet dinner could get a bit same-y if you were there a few days.

Very helpful staff - not many spoke English, but as the previous review mentioned, they would always go and find someone who did.

If you can stand the price, definitely recommended!

Without having any preconceptions, I really liked this hotel. We were only due to stay 2 nights, but I left feeling I'd like to come back and stay for a week or so, sampling all of the facilities and generally just relaxing, not to mention visiting Argentina and Paraguay.
I didn't find it noisy at all - certainly not after Rio. In fact, it had a very pleasant sort of family vibe - and we didn't even have any kids with us.
The decor, the abilities of the staff, the food and the grounds and pool were all spot-on. The bathroom was good - with an excellent long bath for six-footers like me.
We threw the (obviously new) waitress in the bar into a panic by asking for a kir royale - hey, it was on the menu. But she recovered well, and became a force to be reckoned with when opening the wine we ordered in the restairant the following night. Ludicrously over-elaborate, but quite good fun - in the UK, you get the bottle opened and plonked on your table (which is fine by me). None of this business with decanters and holding a naked flame under the bottle.
Mabu Thermas - strongly recommended.

We arrived at Mabu on a friday afternoon extremely hot. To us is was the end to our trip that started in Australia. As i got to the foyer i saw this beautiful hall and pool. Our bedroom was extremely clean not to mention the toilet. Every corner of the resort was bright and clean. The pool area a delight surrounded by the tropical landscape. The most we like was the steam bath and sauna area and those lovely hammocks...Every service was provided on time .Breaskfast was included and you had a variety of fruits, cheeses , breads, juices, and plus plus plus...tasty no doubt.
You find yourself close to the falls, the city and airport. I will definitely recommend it to all of you and i will definitely go back in a year or two.
I will never forget these days!!
Thanks Mabu