This is a beautiful, historic apartment in an equally beautiful historic building. The decor is beautiful and added to the overall experience. The location is amazing and looking out into the Plaza Rio de Janeiro is like something out of a movie. There is some degree of noise, as others have mentioned, but it quiets down at a reasonable hour even on weekends. This was not at all an issue for us.
A few things could have made our stay a little better. One room was missing a curtain when we arrived. It was fixed once we mentioned it, but it was a surprising oversight since it made the second bedroom unusable for sleeping or privacy. Both beds are also very firm, so something to keep in mind.
We did wish some basic cooking amenities were provided: olive oil, salt, butter. These are basic ingredients that many full apartment rentals provide. These smaller details would make the stay even better.
Overall, we were happy with our stay and the opportunity to live in a piece of historic temporarily!