The apartment was very lovely - I really enjoyed the design and the comfort. The bed was very cosy and comfortable, the shower was very strong, spacious and clean. The location of the apartment was right in the heart of Bairro Alto, just by looking out of the window you could experience a touristic highlight: one of the funiculars passing the street right below your window!
On my first night, I was a bit afraid that it would be super loud for sleeping as the street gets quite crowded at night and lots of people like to celebrate there. While it is indeed quite loud in the living room/kitchen, you don't hear a single noise once you close the door and lie down in bed.
The communication with the hosts was very quick and friendly.