I rented the apartment as a digital nomad to work from there with my laptop for 2 1/2 weeks.
Good:
The apartment has a great location few minutes walking distance to the Copacabana beach, so it was nice I could go to the beach for a swim or an afternoon nap whenever I wanted. There's a big cheap supermarket (Mundial) nearby plus several restaurants / fast food / fresh juice places. The metro station is a just few minutes walk away. There's a kitchen with basic equipment to cook your own meals. The bedroom is facing a quiet courtyard and has a view on a nice green tree. Aircon is only installed in the bedroom, but working well and without a lot of noise.
Not so good:
Internet is not suitable for online work. In general it's fast enough for simple video streaming, but it's very unreliable and has short cuts all the time. They rarely last for more than 1 minute, but if you depend on the connection that's a deal breaker. I have a TIM mobile SIM card as a backup, but its signal was also weak and unreliable in the apartment.
Another thing I found disturbing is that all the aircons of the neighbors have their drain pipes on the side of the bedroom. Water drops are falling down onto a metal roof which causes a constant dripping sound all night. It's not particularly loud, but I find it disturbing while sleeping to have this constant dripping sound all night.
In contrast to the nice view of the bedroom the living room is facing a nearby wall, but that's pretty common in Rio.
The kitchen could be equipped a bit more, some simple things like a spatula or a bigger pan could make a great difference.