Here are just a few links to sites and blogs that have written about Casa Carioka. In there you'll find plenty of honest reviews and impressions on the Carioka experience:

Wikipedia page for Rio de Janeiro - plenty of useful information here on the 'Cidade Maravilhosa'

Wikitravel guide for Rio de Janeiro - great for information on Rio's history and things to see while you are there

Wikitravel guide for Copacabana - another good guide but this time more focussed on Copacabana

Flickr group for Rio de Janeiro - many beautiful photos of Rio de Janeiro

Cidade Maravilhosa - really useful guide to Rio with plenty of links to services and sights

Our Hostelbookers entry - plenty of reviews here

Virtual Tourist - features a list of reviews of hostels in Rio, including Casa Carioka

Sem Destino - comprehensive list of hostels/albergues in Rio

Our South American Aaron - blog of a traveller who stayed at Casa Carioka

From Bangkok to Buenos Aires - travel blog

TechTrotter - blog including special mention for Casa Carioka

Sosauce - another blog with mention of Casa Carioka

chinogringo.com - a short guide of things to do in Rio