We stayed 3 nights at the Nonantum Sep 4 - 7, 2013 and had a wonderful time. Well kept, updated and charming. Loved the original Otis elevator ride.
The room was clean and nicely decorated with a wonderful view of the river, large bath and walk-in closet. Only complaint is the noise from the building fans on the side of the room (if windows were closed you could not hear them) and the fact that I could hear the person upstairs (we were on the 3rd floor) when they dropped something and their snoring. We enjoyed the short walk into Kennebunkport and the easy ride to Goose Rocks Beach.
The staff was friendly, the included breakfast was delicious and had a great variety to choose from, the view of the river was beautiful and the includes activies were appreciated and a nice touch - each evening had something different; free cocktail hour, bon fire down by the river, and a marshmellow roast.