This is a big apartment I stayed in for 10 days. The location is great in a Leblon which is very safe and near the metro which takes you into central RJ, walking distance to the beaches of Leblon & Ipanema. The block is getting on a bit but has 24-hour security/porter and you will need to give a copy of photo ID to them to access the block.
The apartment could do with updating but is comfortable and has a/c in every room. The washing machine/cooker works well and there are plenty of pots/pans/crockery etc. The things that dragged down my score overall is the lack of hot water anywhere but the showers. There is no kettle in the kitchen so making tea or/and boiling water to wash dishes needs to be done in a pan. The bedroom window needs repairing because it doesn't close and swings in the win, making noise. The fridge had a leak and the top shelf was covered in water each day. Though there is cable tv you will only get a handful of Brazilian channels (go out I guess). Finally check out is at 10 am which is just too early and though you can leave bags with the porters it would be better if checkout was 12.