Reviewing other opinions will give you a fair idea about what Simon's apartment has to offer. As for myself, I do not regret coming for a second.
I could create great bonds with the people here, especially Bruno who's Simon's friend and the owner of the small convenience store a floor below the apartment. As said in other reviews the favela is a very small community, meaning that you are never treated as a complete stranger by anyone.
Contrary to the popular belief, things are actually safer within the favela than in Copacabana itself. Within the favela, the traffickers are self-policing and they apply a zero-tolerance policy to any sort of abuse or crime committed against the residents.
I recommend this apartment for one person and not more, the convertible couch can bail you and yours friends for two or three nights if needed, but because it is rather small and there is a bar in the middle that will be felt in your back and prevent to use the bed as a comfortable long term solution.