I had a very pleasant stay at Kika's apartment. She is a great host, she showed me parts of Leblon I didn't know and places to buy essentials nearby.
I would definitely recommend it for any incoming PUC exchange student that doesn't have a long term stay in Rio, as it is only 20 minutes from uni by foot, in one of the safest part of Zona Sul. It's also very close to Leblon beach and Ipanema.
Leblon is one of the most expensive part of the city so the price is very affordable if you're on a budget.
As for communication, even without speaking much portuguese we could easily understand each other.
Overall, had a great stay, would recommend if you're on a budget and don't mind dogs.