Like others have mentioned, the apartment is located in a block that is close to a pacified favela. Upon our arrival, the taxi took us through the favela end of Rua Saint Roman, and we didn't know if we would continue to stay at this unit, given there was a police vehicle with its lights flashing in the street as we arrived. We later found out that the Rio police are increasing their presence and you will see cop cars with their lights flashing all over Copacabana and Ipanema. When we saw kids and their parents walking and playing in the street, we stopped worrying immediately. To get to Copacabana beach, you walk out the other end of Rua Saint Roman, and is literally a 5min walk to the main streets, 10mins to the beach.
The apartment block is gated with a doorman like every other apartment block in Rio.
The apartment itself looks amazing when you first arrive with stunning views of the favela. The AirBnB photos are accurate.
We did find a couple of issues however, some of which are maintenance issues:
No cupboards for hanging clothes so you will live out of your suitcase.
No kettle for boiling water to make a cup of tea.
Toilet seat was wobbly and toilet roll holder was broken.
Some light bulbs need replacing.
Window in shower does not lock.
BYO toilet paper (only 1 roll provided), washing powder for clothes, bin bags etc.
We stayed for 4 nights after trekking in Peru and probably needed more amenities than other people who stay for shorter periods, but if you are staying for longer than 4 days, you will need to provide for yourself.
Wifi connection, air con, sound system, bathroom, layout, was all great, just mentioning some things we experienced.