The Amerian was pretty much as I was expecting after reading reviews.
The hotel is nice & a good choice for Iguazu. The location is amazing right on the Tres Frontiers you have Paraguay & Brazil within eyesight!
The rooms are quite dated but perfectly liveable. The bathrooms are badly designed with a sharp stone edge of the bath jutting out just waiting for someone to walk into it (which I did and goodness it hurt!). Amazing views from the balconies.
Unfortunately my main criticism of the hotel is the noise... Every noise in the foyer echoes right up. Although this actually was more noticeable during the day when kids were playing etc so thankfully didn't effect our sleep too much.
Staff were all very helpful, especially when Aerolineas Argentinas went on stike the day we were flying out, staff helped us to make sure we got home - in particular a staff member that was Argentine / American... Can't remember his name unfortunately.
I would recommend this hotel as a nice place to stay in Iguazu. Just don't come expecting a 5 star hotel by western standards.