Here are the facts from my 1-month stay...
Pros: Great location! Close to the metro and buses. And can easily be anywhere in Copa/Ipanema/Leblon. Great Wifi speed. Nice balcony in a good neighborhood. Decent size. The host brought new towels and sheets often. And offered local advice to get settled in. Nice to have a washer in the unit and a full-size refrigerator.
Things to improve: The bed could be more comfortable. And the mattress could have been a little cleaner. I had an issue with ants in the room. Not a ton, but on a few occasions during my month I saw them. And had some bites. Not sure if from the ants or something else. I asked for a cleaning to help and since I was there a month but was denied. The host was mostly very responsive but there was a time or two (specifically in response to a question I posed before choosing the unit) when it was slow. But not a huge issue