We really loved our stay at Helena's place. Helena and her husband are wonderful people, and they live not far away so were a great resource for us with anything that came up, or any questions we had!
I fully recommend this place - it's a nice home, and it's very quiet (which is RARE for Copacabana) but very close to the beach, and to really good restaurants (like Boteco Belmonte - uyyy que delicia!)...overall, a perfect experience!