I did not have a great stay here. The apartment description uses 'calm' and 'relax', but the area is very loud. The location of the apartment and the acoustics of the building mean you have noise from the Lapa district and the Circo Voador concert venue most nights (search it), sometimes until 3 or 4 am. There are also events hosted in the area (such as a music festival). The host insisted it was only Carnaval, but I can assure you this will be a year-round thing. I told him as much and he gave a rude response. The street is also a cut through for traffic and also you will have partiers from Lapa.
Also, it's Centro, so it's not very safe as it gets later and there are lots of homeless camping outside the building.
The inside of the apartment is excellent. But the electronic key has some downside. During a storm I was doing my laundry and I got locked out of the apartment for 20 minutes. If you lose your phone or it has no power, it could be a problem with entering the building.