Excellent location in a hip, quiet, and safe neighbourhood. We stayed through January and the apartment was warm (there's heating!). The apartment is within walking distance to several grocery stores and many bars and restaurants (we recommend Alecrim). The historical centre is reachable on foot within 10 minutes or so. If you need to go further, Sao Bento station is 10 minutes on foot and the metro station in 5. The hosts were very flexible, arranged for transfers to the apartment, and met us late on Sunday night. They were available to answer all our questions.
The bed and pillows are very comfortable. Kitchen is well equipped for a long stay. Wi-fi was strong and reliable. Plenty of hot water in the shower, though a minor complaint is that the pressure is not strong. Overall a comfortable stay.