We had a great time in the flat in Copacabana, the location is great, just one block from the beach, and the communication with Genilza was always very fast and easy. Also a very good price for what you get. There is a 24h reception where you can also leave your keys when going out so we felt very secure there.
It would have been good if the kitchen had been equipped with basics like salt or oil so that you don't need to buy that for just a couple of days.