Me and my husband stayed for 2 weeks in Antonio's house in Rio.
Antonio is a wonderful person and a very good friend. He always gives a hand and help you with an advice or recommendation. We shared a lot of interesting things about our cultures and had two nights out with dance and caipiriña.
The place is very authentic and located in the centre of Rio, just few minutes walking from Metropolitan Cathedral and a metro station, near lots of good places for dance live music, but the house is on a quiet street, so noises wouldn't bother you if you want to sleep this night. Room has everything you need, including private bathroom and washing machine. Also two wonderful cats live in and near the house.
The place is highly recommended, we hope to return some day!